Terminal device, base station device, communication method, and integrated circuit for processing demodulation reference signals

ABSTRACT

There are provided a terminal device, a base station device, and an integrated circuit that enable a base station device and a terminal device to determine parameters related to uplink signals or uplink reference signals and to perform efficient communication. A terminal device that transmits a demodulation reference signal associated with a physical uplink shared channel to a base station device includes determining a sequence group number on the basis of a value of a parameter configured by a higher layer, determining the sequence group number on the basis of a physical layer cell identity, and generating a sequence of the demodulation reference signal on the basis of the sequence group number, wherein the sequence group number is determined on the basis of the physical layer cell identity in a case where a transmission on the physical uplink shared channel corresponding to a downlink control information format to which CRC parity bits scrambled by a Temporary C-RNTI are attached is performed in a random access procedure.

This application is a Continuation of copending application No.14/384,263 filed on Sep. 10, 2014, which is the U.S. National Phase ofPCT/JP2013/057009, filed Mar. 13, 2013, and which claims priority toApplication No. 2012-056899 filed in Japan, on Mar. 14, 2012. The entirecontents of all of the above applications is hereby incorporated byreference.

TECHNICAL FIELD

The present invention relates to a terminal device, a base stationdevice, a communication method, an integrated circuit, and a wirelesscommunication system.

BACKGROUND ART

In wireless communication systems such as systems based on LTE (LongTerm Evolution) and LTE-A (LTE-Advanced), which are developed by 3GPP(Third Generation Partnership Project), and WiMAX (WorldwideInteroperability for Microwave Access), which is developed by IEEE (TheInstitute of Electrical and Electronics engineers), a base station and aterminal each include one or a plurality of transmit/receive antennas,and utilize, for example, MIMO (Multiple Input Multiple Output)technology to achieve high-speed data transmission.

In the wireless communication systems, the support of MU-MIMO (MultipleUser MIMO) in which a plurality of terminals perform spatialmultiplexing using the same frequency and time resources is beingexamined. The support of a CoMP (Cooperative Multipoint) transmissionscheme in which a plurality of base stations cooperate with one anotherto perform interference coordination is also being examined. Forexample, a wireless communication system designed to use heterogeneousnetwork deployment (HetNet) implemented by a wide-coverage macro basestation, an RRH (Remote Radio Head) with coverage smaller than the macrobase station, and so on is being examined.

In the above-described wireless communication systems, interferenceoccurs if uplink signals (uplink data or uplink control information)transmitted from a plurality of terminals have the same characteristics.Interference also occurs if uplink reference signals transmitted from aplurality of terminals have the same characteristics. To mitigate oreliminate interference between demodulation reference signals (alsoreferred to as DMRSs) transmitted from a plurality of terminals, forexample, a method for orthogonalizing the demodulation reference signalshas been proposed (NPL 1).

CITATION LIST Non Patent Literature

NPL 1: DMRS enhancements for UL CoMP; 3GPP TSG RAN WG1 meeting #68R1-120277, Feb. 6th-10th, 2012.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, there is no description regarding a specific procedure whichallows a base station and a terminal in a wireless communication systemto determine parameters related to uplink signals or uplink referencesignals. That is, no description is given of how a base station and aterminal determine parameters related to uplink signals or uplinkreference signals and perform communication.

The present invention has been made in light of the foregoing problem,and it is an object of the present invention to provide a base stationdevice, a terminal device, a communication method, an integratedcircuit, and a communication system that enable a base station and aterminal to determine parameters related to uplink signals or uplinkreference signals and to perform efficient communication.

Means for Solving the Problems

(1) To achieve the object described above, the present invention takesthe following solutions: A terminal device that transmits a demodulationreference signal associated with a physical uplink shared channel to abase station device includes determining a sequence group number on thebasis of a value of a parameter configured by a higher layer,determining the sequence group number on the basis of a physical layercell identity, and generating a sequence of the demodulation referencesignal on the basis of the sequence group number, wherein the sequencegroup number is determined on the basis of the physical layer cellidentity in a case where a transmission on the physical uplink sharedchannel corresponding to a downlink control information format to whichCRC parity bits scrambled by a Temporary C-RNTI are attached isperformed in a random access procedure.

(2) In addition, a terminal device that transmits a demodulationreference signal associated with a physical uplink shared channel to abase station device includes determining a sequence group number on thebasis of a value of a parameter configured by a higher layer,determining the sequence group number on the basis of a physical layercell identity, and generating a sequence of the demodulation referencesignal on the basis of the sequence group number, wherein the sequencegroup number is determined on the basis of the physical layer cellidentity in a case where a transmission of a message 3 on the physicaluplink shared channel corresponding to a random access response grant isperformed in a random access procedure.

(3) In addition, a base station device that receives a demodulationreference signal associated with a physical uplink shared channel from aterminal device, a sequence of the demodulation reference signal beinggenerated on the basis of a sequence group number, includes identifyingthe sequence group number on the basis of a value of a parameter of ahigher layer, and identifying the sequence group number on the basis ofa physical layer cell identity, wherein the sequence group number isidentified on the basis of the physical layer cell identity in a casewhere a downlink control information format to which CRC parity bitsscrambled by a Temporary C-RNTI are attached is used for scheduling of atransmission on the physical uplink shared channel in a random accessprocedure.

(4) In addition, a base station device that receives a demodulationreference signal associated with a physical uplink shared channel from aterminal device, a sequence of the demodulation reference signal beinggenerated on the basis of a sequence group number, includes identifyingthe sequence group number on the basis of a value of a parameter of ahigher layer, and identifying the sequence group number on the basis ofa physical layer cell identity, wherein the sequence group number isidentified on the basis of the physical layer cell identity in a casewhere a random access response grant is used for scheduling of atransmission of a message 3 on the physical uplink shared channel in arandom access procedure.

(5) In addition, an integrated circuit mountable on a terminal devicethat transmits a demodulation reference signal associated with aphysical uplink shared channel to a base station device causes theterminal device to perform functions including determining a sequencegroup number on the basis of a value of a parameter configured by ahigher layer; determining the sequence group number on the basis of aphysical layer cell identity; and generating a sequence of thedemodulation reference signal on the basis of the sequence group number,wherein the integrated circuit causes the terminal device to perform afunction including determining the sequence group number on the basis ofthe physical layer cell identity in a case where a transmission on thephysical uplink shared channel corresponding to a downlink controlinformation format to which CRC parity bits scrambled by a TemporaryC-RNTI are attached is performed in a random access procedure.

(6) In addition, an integrated circuit mountable on a terminal devicethat transmits a demodulation reference signal associated with aphysical uplink shared channel to a base station device causes theterminal device to perform functions including determining a sequencegroup number on the basis of a value of a parameter configured by ahigher layer; determining the sequence group number on the basis of aphysical layer cell identity; and generating a sequence of thedemodulation reference signal on the basis of the sequence group number,wherein the integrated circuit causes the terminal device to perform afunction including determining the sequence group number on the basis ofthe physical layer cell identity in a case where a transmission of amessage 3 on the physical uplink shared channel corresponding to arandom access response grant is performed in a random access procedure.

(7) In addition, an integrated circuit mountable on a base stationdevice that receives a demodulation reference signal associated with aphysical uplink shared channel from a terminal device, a sequence of thedemodulation reference signal being generated on the basis of a sequencegroup number, causes the base station device to perform functionsincluding identifying the sequence group number on the basis of a valueof a parameter of a higher layer; and identifying the sequence groupnumber on the basis of a physical layer cell identity, wherein theintegrated circuit causes the base station device to perform a functionincluding identified the sequence group number on the basis of thephysical layer cell identity in a case where a downlink controlinformation format to which CRC parity bits scrambled by a TemporaryC-RNTI are attached is used for scheduling of a transmission on thephysical uplink shared channel in a random access procedure.

(8) In addition, an integrated circuit mountable on a base stationdevice that receives a demodulation reference signal associated with aphysical uplink shared channel from a terminal device, a sequence of thedemodulation reference signal being generated on the basis of a sequencegroup number, causes the base station device to perform functionsincluding identifying the sequence group number on the basis of a valueof a parameter of a higher layer; and identifying the sequence groupnumber on the basis of a physical layer cell identity, wherein theintegrated circuit causes the base station device to perform a functionincluding identifying the sequence group number on the basis of thephysical layer cell identity in a case where a random access responsegrant is used for scheduling of a transmission of a message 3 on thephysical uplink shared channel in a random access procedure.

Effects of the Invention

According to the present invention, a base station and a terminal candetermine parameters related to uplink signals or uplink referencesignals and perform efficient communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram illustrating a configuration of abase station according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram illustrating a configuration of aterminal according to the embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating an example of communicationaccording to the embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a downlink signal.

FIG. 5 is a diagram explaining the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described hereinafter. Awireless communication system according to the embodiment of the presentinvention includes, as base station devices (hereinafter also referredto as base stations, transmitting devices, cells, serving cells,transmit stations, transmission points, transmit antenna groups,transmit antenna port groups, or eNodeBs), a primary base station (alsoreferred to as a macro base station, a first base station, a firstcommunication device, a serving base station, an anchor base station, ora primary cell) and a secondary base station (also referred to as anRRH, a pico base station, a femto base station, a Home eNodeB, a secondbase station device, a second communication device, a cooperative basestation group, a cooperative base station set, a cooperative basestation, or a secondary cell). The wireless communication system furtherincludes a mobile station device (hereinafter also referred to as aterminal, a terminal device, a mobile terminal, a receiving device, areception point, a receiver terminal, a third communication device, areceive antenna group, a receive antenna port group, or user equipment(UE)).

The secondary base station may be one of a plurality of secondary basestations. For example, the primary base station and the secondary basestation utilize the heterogeneous network deployment, in which part orall of the coverage of the secondary base station is included in thecoverage of the primary base station, to communicate with the terminal.

FIG. 1 is a schematic block diagram illustrating a configuration of abase station according to an embodiment of the present invention. Thebase station illustrated in FIG. 1 is a primary base station or asecondary base station. The base station includes a data control unit101, a transmit data modulation unit 102, a radio unit 103, a schedulingunit 104, a channel estimation unit 105, a received data demodulationunit 106, a data extraction unit 107, a higher layer 108, and an antenna109. The radio unit 103, the scheduling unit 104, the channel estimationunit 105, the received data demodulation unit 106, the data extractionunit 107, the higher layer 108, and the antenna 109 constitute areceiving section. The data control unit 101, the transmit datamodulation unit 102, the radio unit 103, the scheduling unit 104, thehigher layer 108, and the antenna 109 constitute a transmitting section.Here, each of the components constituting the base station is alsoreferred to as a unit.

The data control unit 101 receives transport channels from thescheduling unit 104. The data control unit 101 maps the transportchannels and signals generated in the physical layer to physicalchannels on the basis of scheduling information input from thescheduling unit 104. The mapped pieces of data are output to thetransmit data modulation unit 102.

The transmit data modulation unit 102 modulates/codes transmit data. Thetransmit data modulation unit 102 performs signal processing operations,such as modulation/coding, serial/parallel conversion of input signals,IFFT (Inverse Fast Fourier Transform) processing, and CP (Cyclic Prefix)insertion, on the data input from the data control unit 101 on the basisof the scheduling information supplied from the scheduling unit 104 andso on to generate transmit data, and outputs the transmit data to theradio unit 103.

The radio unit 103 generates a radio signal by up-converting thetransmit data input from the transmit data modulation unit 102 to aradio frequency signal, and transmits the radio signal to a terminal viathe antenna 109. In addition, the radio unit 103 receives a radio signalreceived from the terminal via the antenna 109, down-converts the radiosignal to a baseband signal, and outputs the received data to thechannel estimation unit 105 and the received data demodulation unit 106.

The scheduling unit 104 performs operations such as mapping betweenlogical channels and transport channels and downlink and uplinkscheduling. Since the scheduling unit 104 controls the physical-layerprocessors in an integrated manner, an interface exists between thescheduling unit 104 and the respective units, namely, the antenna 109,the radio unit 103, the channel estimation unit 105, the received datademodulation unit 106, the data control unit 101, the transmit datamodulation unit 102, and the data extraction unit 107.

In the downlink scheduling, the scheduling unit 104 controlstransmission on transport channels and physical channels and generatesscheduling information on the basis of uplink control informationreceived from the terminal, scheduling information input from the higherlayer 108, and so on. The scheduling information used for the downlinkscheduling is output to the data control unit 101.

In the uplink scheduling, the scheduling unit 104 generates schedulinginformation on the basis of an uplink channel state output from thechannel estimation unit 105, the scheduling information input from thehigher layer 108, and so on. The scheduling information used for theuplink scheduling is output to the data control unit 101.

In addition, the scheduling unit 104 maps downlink logical channelsinput from the higher layer 108 to transport channels, and outputs thetransport channels to the data control unit 101. The scheduling unit 104further maps uplink transport channels and control data input from thedata extraction unit 107 to uplink logical channels after processing theuplink transport channels and the control data, if necessary, andoutputs the uplink logical channels to the higher layer 108.

The channel estimation unit 105 estimates an uplink channel state fromuplink reference signals (e.g., demodulation reference signals) for thedemodulation of uplink data, and outputs the uplink channel state to thereceived data demodulation unit 106. The channel estimation unit 105further estimates an uplink channel state from uplink reference signals(e.g., sounding reference signals) for uplink scheduling, and outputsthe uplink channel state to the scheduling unit 104.

The received data demodulation unit 106 demodulates received data. Thereceived data demodulation unit 106 performs a demodulation process onmodulated data input from the radio unit 103 by preforming signalprocessing operations, such as a DFT transform, subcarrier mapping, andan IFFT transform, on the basis of the estimated uplink channel stateinput from the channel estimation unit 105, and outputs the receiveddata to the data extraction unit 107.

The data extraction unit 107 checks the received data input from thereceived data demodulation unit 106 for correctness, and outputs thecheck result (e.g., ACK or NACK) to the scheduling unit 104. Inaddition, the data extraction unit 107 separates the data input from thereceived data demodulation unit 106 into transport channels and physicallayer control data, and outputs the transport channels and the physicallayer control data to the scheduling unit 104.

The higher layer 108 performs the processing of the radio resourcecontrol (RRC) layer and the processing of the MAC (Media Access Control)layer. Since the higher layer 108 controls the lower-layer processors inan integrated manner, an interface exists between the higher layer 108and the respective units, namely, the scheduling unit 104, the antenna109, the radio unit 103, the channel estimation unit 105, the receiveddata demodulation unit 106, the data control unit 101, the transmit datamodulation unit 102, and the data extraction unit 107.

FIG. 2 is a schematic block diagram illustrating a configuration of aterminal according to the embodiment of the present invention. Theterminal includes a data control unit 201, a transmit data modulationunit 202, a radio unit 203, a scheduling unit 204, a channel estimationunit 205, a received data demodulation unit 206, a data extraction unit207, a higher layer 208, and an antenna 209. The data control unit 201,the transmit data modulation unit 202, the radio unit 203, thescheduling unit 204, the higher layer 208, and the antenna 209constitute a transmitting section. The radio unit 203, the schedulingunit 204, the channel estimation unit 205, the received datademodulation unit 206, the data extraction unit 207, the higher layer208, and the antenna 209 constitute a receiving section. Here, each ofthe components constituting the terminal is also referred to as a unit.

The data control unit 201 receives transport channels from thescheduling unit 204. In addition, the data control unit 201 maps thetransport channels and signals generated in the physical layer tophysical channels on the basis of scheduling information input from thescheduling unit 204. The mapped pieces of data are output to thetransmit data modulation unit 202.

The transmit data modulation unit 202 modulates/codes transmit data. Thetransmit data modulation unit 202 performs signal processing operations,such as modulation/coding, serial/parallel conversion of input signals,IFFT processing, and CP insertion, on the data input from the datacontrol unit 201 to generate transmit data, and outputs the transmitdata to the radio unit 203.

The radio unit 203 generates a radio signal by up-converting thetransmit data input from the transmit data modulation unit 202 to aradio frequency signal, and transmits the radio signal to a base stationvia the antenna 209. In addition, the radio unit 203 receives a radiosignal received from the base station via the antenna 209, down-convertsthe radio signal to a baseband signal, and outputs the received data tothe channel estimation unit 205 and the received data demodulation unit206.

The scheduling unit 104 performs operations such as mapping betweenlogical channels and transport channels and downlink and uplinkscheduling. Since the scheduling unit 204 controls the physical-layerprocessors in an integrated manner, an interface exists between thescheduling unit 204 and the respective units, namely, the antenna 209,the data control unit 201, the transmit data modulation unit 202, thechannel estimation unit 205, the received data demodulation unit 206,the data extraction unit 207, and the radio unit 203.

In the downlink scheduling, the scheduling unit 204 controls receptionon transport channels and physical channels and generates schedulinginformation on the basis of downlink control information received from abase station, scheduling information input from the higher layer 208,and so on. The scheduling information used for the downlink schedulingis output to the data control unit 201.

In the uplink scheduling, the scheduling unit 204 performs a schedulingprocess to map the uplink logical channels input from the higher layer208 to transport channels, and generates scheduling information used forthe uplink scheduling, on the basis of downlink control informationreceived from a base station, the scheduling information input from thehigher layer 208, and so on. The scheduling information is output to thedata control unit 201.

In addition, the scheduling unit 204 maps uplink logical channels inputfrom the higher layer 208 to transport channels, and outputs thetransport channels to the data control unit 201. The scheduling unit 204also outputs channel state information input from the channel estimationunit 205 and a result of checking CRC (Cyclic Redundancy Check) paritybits (also referred to simply as the CRC) which is input from the dataextraction unit 207 to the data control unit 201.

In addition, the scheduling unit 204 determines parameters related touplink signals, and generates uplink signals using the determinedparameters. The scheduling unit 204 further determines parametersrelated to reference signals, and generates reference signals using thedetermined parameters.

The channel estimation unit 205 estimates a downlink channel state fromdownlink reference signals (e.g., demodulation reference signals) forthe demodulation of downlink data, and outputs the downlink channelstate to the received data demodulation unit 206. In addition, thereceived data demodulation unit 206 demodulates received data input fromthe radio unit 203, and outputs the received data to the data extractionunit 207.

The data extraction unit 207 checks the received data input from thereceived data demodulation unit 206 for correctness, and outputs thecheck result (e.g., ACK or NACK) to the scheduling unit 204. Inaddition, the data extraction unit 207 separates the received data inputfrom the received data demodulation unit 206 into transport channels andphysical layer control data, and outputs the transport channels and thephysical layer control data to the scheduling unit 204.

The higher layer 208 performs the processing of the radio resourcecontrol layer and the MAC layer. Since the higher layer 208 controls thelower-layer processors in an integrated manner, an interface existsbetween the higher layer 208 and the respective units, namely, thescheduling unit 204, the antenna 209, the data control unit 201, thetransmit data modulation unit 202, the channel estimation unit 205, thereceived data demodulation unit 206, the data extraction unit 207, andthe radio unit 203.

FIG. 3 is a schematic diagram illustrating an example of communicationaccording to the embodiment of the present invention. In FIG. 3, aterminal 303 communicates with a primary base station 301 and/or asecondary base station 302. In addition, a terminal 304 communicateswith the primary base station 301 and/or the secondary base station 302.

In FIG. 3, when transmitting an uplink signal to a base station, aterminal transmits the uplink signal with which the demodulationreference signal (DMRS), which is a signal known between the basestation and the terminal, is multiplexed. The uplink signal includesuplink data (uplink shared channel (UL-SCH) or an uplink transportblock). In addition, the uplink signal includes uplink controlinformation (UCI). Here, the UL-SCH is a transport channel.

For example, the uplink data is mapped to a physical uplink sharedchannel (PUSCH). The uplink control information is mapped to the PUSCHor a physical uplink control channel (PUCCH). That is, in a wirelesscommunication system, the demodulation reference signal associated withtransmission of the PUSCH (transmission on the PUSCH) is supported. Inthe wireless communication system, furthermore, the demodulationreference signal associated with transmission of the PUCCH (transmissionon the PUCCH) is supported.

In the following, the demodulation reference signal associated withtransmission of the PUSCH is also represented as a first referencesignal. The demodulation reference signal associated with transmissionof the PUCCH is also represented as a second reference signal. The firstreference signal and the second reference signal are also represented asreference signals.

That is, the first reference signal is used for demodulation of thePUSCH. For example, the first reference signal is transmitted onresource blocks (also referred to as physical resource blocks, physicalresources, or resources) to which the corresponding PUSCH is mapped. Thesecond reference signal is used for demodulation of the PUCCH. Forexample, the second reference signal is transmitted on resource blocksto which the corresponding PUCCH is mapped.

Specifically, the terminal 303 multiplexes the reference signals withthe uplink signal that is transmitted to the primary base station 301,and transmits the uplink signal through an uplink 305. In addition, theterminal 303 multiplexes the reference signals with the uplink signalthat is transmitted to the secondary base station 302, and transmits theuplink signal through an uplink 306. The terminal 304 multiplexes thereference signals with the uplink signal that is transmitted to theprimary base station 301, and transmits the uplink signal through anuplink 307. In addition, the terminal 304 multiplexes the referencesignals with the uplink signal that is transmitted to the secondary basestation 302, and transmits the uplink signal through an uplink 308.

If the uplink signal transmitted from the terminal 303 and the uplinksignal transmitted from the terminal 304 have the same characteristics,interference occurs. Interference also occurs if the reference signaltransmitted from the terminal 303 and the reference signal transmittedfrom the terminal 304 have the same characteristics. For example, ifinterference occurs in reference signals transmitted from a plurality ofterminals, the accuracy with which a channel state used for demodulationof uplink signals will be significantly reduced.

To address this, it is desirable to orthogonalize the reference signaltransmitted from the terminal 303 and the reference signal transmittedfrom the terminal 304. In addition, it is desirable to orthogonalize theuplink signal transmitted from the terminal 303 and the uplink signaltransmitted from the terminal 304. In addition, it is desirable torandomize interference between the reference signal transmitted from theterminal 303 and the reference signal transmitted from the terminal 304.In addition, it is desirable to randomize interference between theuplink signal transmitted from the terminal 303 and the uplink signaltransmitted from the terminal 304.

In FIG. 3, different cell identities (also referred to as Cell IDs)(also referred to as Different cell IDs) may be configured for theprimary base station 301 and the secondary base station 302. The samecell identity (also referred to as the Shared cell ID or Same cell ID)may be configured for all or some of the primary base station 301 andthe secondary base station 302. A cell identity is also referred to as aphysical layer cell identity (a physical layer cell identifier).

In FIG. 3, furthermore, an aggregation of a plurality of serving cells(also referred to simply as cells) is supported (referred to as acarrier aggregation or a cell aggregation) in the downlink and theuplink. For example, a transmission bandwidth of up to 110 resourceblocks in each of the serving cells can be used. In the carrieraggregation, one of the serving cells is defined as a primary cell(Pcell). In the carrier aggregation, furthermore, the serving cellsother than the primary cell are defined as secondary cells (Scells).

In the downlink, a carrier corresponding to the serving cell is definedas a downlink component carrier (DLCC). In the downlink, furthermore, acarrier corresponding to the primary cell is defined as a downlinkprimary component carrier (DLPCC). In the downlink, furthermore, acarrier corresponding to a secondary cell is defined as a downlinksecondary component carrier (DLSCC).

In the uplink, a carrier corresponding to the serving cell is defined asan uplink component carrier (ULCC). In the uplink, furthermore, acarrier corresponding to the primary cell is defined as an uplinkprimary component carrier (ULPCC). In the uplink, furthermore, a carriercorresponding to a secondary cell is defined as an uplink secondarycomponent carrier (ULSCC).

That is, in the carrier aggregation, a plurality of component carriersare aggregated to support a wide transmission bandwidth. Here, forexample, the primary base station 301 may also be regarded as theprimary cell, and the secondary base station 302 may also be regarded asa secondary cell (the base station may perform configuration for theterminal) (also referred to as HetNet deployment with a carrieraggregation).

FIG. 4 is a diagram illustrating an example of a downlink signal. InFIG. 4, physical downlink shared channel (PDSCH) resource regions towhich downlink data (downlink shared channel (DL-SCH) or downlinktransport blocks) is mapped are illustrated. The DL-SCH is a transportchannel.

A physical downlink control channel (PDCCH; Physical Downlink ControlChannel) resource region to which downlink control information (DCI;Downlink Contol Information) is mapped is also illustrated. In addition,an E-PDCCH (Enhanced-PDCCH) resource region to which downlink controlinformation is mapped is illustrated.

For example, the PDCCH is mapped to the first through third OFDM symbolsin a downlink resource region. In addition, the E-PDCCH is mapped to thefourth through twelfth OFDM symbols in the downlink resource region. Inaddition, the E-PDCCH is mapped to the first slot and the second slot inone subframe. In addition, the PDSCH and the E-PDCCH are subjected toFDM (Frequency Division Multiplexing). In the following, the E-PDCCH isincluded in the PDCCH.

The PDCCH is used to signal (specify) downlink control information tothe terminal. A plurality of formats are defined for downlink controlinformation that is transmitted on the PDCCH. The formats of thedownlink control information are also referred to as DCI formats.

For example, DCI format 1 and DCI format 1A, which are used for thescheduling of one PDSCH (transmission of one PDSCH codeword or onedownlink transport block) in one cell, are defined as downlink DCIformats. In addition, DCI format 2, which is used for the scheduling ofone PDSCH (transmission of up to two PDSCH codewords or up to twodownlink transport blocks) in one cell, is defined as a downlink DCIformat.

For example, the downlink DCI format includes downlink controlinformation such as information regarding PDSCH resource allocation andinformation regarding MCS (Modulation and Coding scheme). The downlinkDCI format may include information regarding the base sequence index(also referred to as the base sequence identity). The downlink DCIformat may include information regarding the base sequence indexassociated with PUCCH (also referred to as the base sequence identityassociated with PUCCH). In the following, the DCI format used forscheduling of the PDSCH is also represented as a downlink assignment.

In addition, for example, DCI format 0, which is used for the schedulingof one PUSCH (transmission of one PUSCH codeword or one uplink transportblock) in one cell, is defined as an uplink DCI format. In addition, DCIformat 4, which is used for the scheduling of one PUSCH (transmission ofup to two PUSCH codewords or up to two uplink transport blocks) in onecell, is defined as an uplink DCI format. That is, the DCI format 4 isused for scheduling of the PUSCH transmission (transmission mode) thatuses a plurality of antenna ports.

For example, the uplink DCI format includes downlink control informationsuch as information regarding PUSCH resource allocation and informationregarding MCS (Modulation and Coding scheme). The uplink DCI format mayinclude information regarding the base sequence index. The uplink DCIformat may include information for giving instructions to enable ordisable a sequence group hopping and/or a sequence hopping. In thefollowing, the DCI format used for scheduling of the PUSCH is alsorepresented as an uplink grant.

In addition, the PDSCH is used for the transmission of downlink data.Furthermore, the PDSCH is used to signal (specify) a random accessresponse grant to the terminal. The random access response grant is usedfor scheduling of the PUSCH. The random access response grant isprovided to the physical layer by a higher layer (e.g., the MAC layer).

For example, the base station configures a random access response thatis transmitted as message 2 in a random access procedure so that therandom access response includes the random access response grant, andtransmits the random access response. In addition, the base stationtransmits the random access response grant corresponding to message 1transmitted from the terminal in the random access procedure. Inaddition, the base station transmits the random access response grantfor the transmission of message 3 in the random access procedure. Thatis, the random access response grant can be used for scheduling of thePUSCH for the transmission of message 3 in the random access procedure.

In FIG. 4, the terminal monitors a set of PDCCH candidates. Here, aPDCCH candidate represents a candidate for which the PDCCH may possiblybe allocated and transmitted by the base station. A PDCCH candidate iscomposed of one or a plurality of control channel elements (CCEs). Theterm “monitor” means that the terminal attempts to decode each PDCCH inthe set of PDCCH candidates in accordance with all the DCI formats to bemonitored. The set of PDCCH candidates that the terminal monitors isalso referred to as a search space. That is, the search space is a setof resources that may possibly be used by the base station for PDCCHtransmission.

Furthermore, a common search space (CSS) and a user-equipment-specificsearch space (USS; UE-Specific Search Space, terminal-specific(terminal-unique) search space) are configured (defined or set) in thePDCCH resource region.

That is, in FIG. 4, the CSS and/or the USS are configured in the PDCCHresource region. In addition, the CSS and/or the USS are configured inthe E-PDCCH resource region. The terminal monitors the PDCCH in the CSSand/or USS in the PDCCH resource region, and detects a PDCCH addressedto the terminal. In addition, the terminal monitors the E-PDCCH in theCSS and/or the USS in the E-PDCCH resource region, and detects anE-PDCCH addressed to the terminal.

The CSS is used for the transmission of downlink control information toa plurality of terminals. That is, the CSS is defined by a resourcecommon to a plurality of terminals. For example, the CSS is composed ofCCEs having numbers that are predetermined between the base station andthe terminal. For example, the CSS is composed of CCEs having indices 0to 15. The CSS may be used for the transmission of downlink controlinformation to a specific terminal. That is, the base station transmits,in the CSS, a DCI format intended for a plurality of terminals and/or aDCI format intended for a specific terminal.

The USS is used for the transmission of downlink control information toa specific terminal. That is, the USS is defined by a resource dedicatedto a certain terminal. That is, the USS is defined independently foreach terminal. For example, the USS is composed of CCEs having numbersthat are determined on the basis of a radio network temporary identifier(RNTI; Radio Network Temporary Identifier) assigned by the base station,a slot number in a radio frame, an aggregation level, or the like. Here,RNTIs include a C-RNTI (Cell RNTI) and a Temporary C-RNTI. That is, thebase station transmits, in the USS, a DCI format intended for a specificterminal.

Here, an RNTI assigned to the terminal by the base station is used forthe transmission of downlink control information (transmission on thePDCCH). Specifically, CRC (Cyclic Redundancy Check parity bits (alsoreferred to simply as the CRC), which are generated on the basis ofdownlink control information (or, instead, DCI format), are attached tothe downlink control information, and, after attachment, the CRC paritybits are scrambled by the RNTI.

The terminal attempts to decode the downlink control information withthe CRC parity bits scrambled by the RNTI, and detects a PDCCH in whichthe CRC is successful as a PDCCH addressed to the terminal (alsoreferred to as blind decoding). Here, RNTIs include the C-RNTI and theTemporary C-RNTI. That is, the terminal decodes the PDCCH with the CRCscrambled by the C-RNTI. In addition, the terminal decodes the PDCCHwith the CRC scrambled by the Temporary C-RNTI.

The C-RNTI is a unique identifier used to identify RRC (Radio ResourceControl) connection and scheduling. For example, the C-RNTI is used fordynamically scheduled unicast transmission.

The Temporary C-RNTI is an identifier used for the random accessprocedure. The base station transmits the Temporary C-RNTI by includingthe Temporary C-RNTI in the random access response. For example, theTemporary C-RNTI is used in the random access procedure to identify aterminal that is currently performing the random access procedure. Inaddition, the Temporary C-RNTI is used for a retransmission of message 3in the random access procedure. That is, in order for the terminal toretransmit message 3, the base station transmits downlink controlinformation on the PDCCH with the CRC scrambled by the Temporary C-RNTI.That is, the terminal changes the interpretation of the downlink controlinformation on the basis of the type of RNTI by which the CRC has beenscrambled.

For example, the terminal executes the random access procedure to takesynchronization with the base station in the time domain. In addition,the terminal executes the random access procedure for initial connectionestablishment. In addition, the terminal executes the random accessprocedure to make a handover. In addition, the terminal executes therandom access procedure for connection re-establishment (connectionre-establishment). In addition, the terminal executes the random accessprocedure to make a request for UL-SCH resources.

When a PDSCH resource is scheduled using downlink control informationtransmitted on the PDCCH, the terminal receives downlink data on thescheduled PDSCH. When a PUSCH resource is scheduled using downlinkcontrol information transmitted on the PDCCH, the terminal transmitsuplink data and/or uplink control information on the scheduled PUSCH. Asdescribed above, the terminal attempts to decode the downlink controlinformation with the CRC parity bits scrambled by the RNTI, and detectsa PDCCH in which the CRC is successful as a PDCCH addressed to theterminal. Here, RNTIs include the C-RNTI and the Temporary C-RNTI. Here,the first reference signal is multiplexed with the uplink data and/orthe uplink control information transmitted on the PUSCH.

In addition, the terminal transmits the uplink control information onthe PUCCH. For example, the terminal transmits information indicatingACK/NACK for downlink data (also referred to as ACK/NACK in HARQ; HybridAutomatic Repeat Request) on the PUCCH. Here, the terminal transmits theuplink control information using the PUCCH resource corresponding to thenumber of the first CCE (also referred to as the lowest CCE index usedfor composing the PDCCH) which has been used for PDCCH transmission(used for the transmission of the downlink assignment). Here, the secondreference signal is multiplexed in the transmission of the uplinkcontrol information transmitted on the PUCCH.

In addition, the base station and the terminal transmit and receive asignal in a higher layer. For example, the base station and the terminaltransmit and receive a radio resource control signal (also referred toas RRC signaling; Radio Resource Control signal, RRC message; RadioResource Control message, or RRC information; Radio Resource Controlinformation) in the RRC layer (Layer 3). Here, dedicated signalingtransmitted from the base station to a certain terminal in the RRC layeris also referred to as a dedicated signal (dedicated signaling). Thatis, configurations (information) specific to (unique to) a certainterminal are signaled by the base station by using the dedicated signal.

In addition, the base station and the terminal transmit and receive aMAC control element in the MAC (Media Access Control) layer (Layer 2).Here, RRC signaling and/or MAC control element is also referred to ashigher layer signaling.

An example of a method for generating a reference signal sequencer^((α)) _(u,v) will be discussed hereinafter. The reference signalsequence is used to generate a sequence of the first reference signal.In addition, the reference signal sequence is used to generate asequence of the second reference signal. For example, the referencesignal sequence is defined in accordance with mathematical expression 1by a cyclic shift of a base sequence r ^((α)) _(u,v)(n).

$\begin{matrix}{{r_{u,v}^{(\alpha)} = {{\mathbb{e}}^{{j\alpha}\; n}{{\overset{\_}{r}}_{u,v}(n)}}},{0 \leq n \leq M_{SC}^{RS}}} & \left\lbrack {{Math}.\; 1} \right\rbrack\end{matrix}$

That is, the reference signal sequence is generated by applying thecyclic shift α to the base sequence. In addition, multiple referencesignal sequences are defined from a single base sequence throughdifferent values of the cyclic shift α. Here, M_(SC) ^(RS) denotes thelength of the reference signal sequence, and is represented by, forexample, M_(SC) ^(RS)=mN_(SC) ^(RB). In addition, N_(SC) ^(RB) denotesthe size of a resource block in the frequency domain, and is representedby, for example, the number of subcarriers.

In addition, the base sequence is divided into groups. That is, the basesequence is represented by a group number (also referred to as asequence group number) u and a base sequence number v within thecorresponding group. For example, the base sequence is divided into 30groups, and each of the groups includes two base sequences. In addition,the sequence group hopping is applied to the 30 groups. In addition, thesequence hopping is applied to two base sequences in one group.

Here, each of the sequence group number u and the base sequence number vcan vary in time. In addition, the definition of the base sequencedepends on the sequence length M_(SC) ^(RS). For example, if M_(SC)^(RS)≧3N_(SC) ^(RB), the base sequence is given by mathematicalexpression 2.

$\begin{matrix}{{{{\overset{\_}{r}}_{u,v}(n)} = {x_{q}\left( {n\;{mod}\; N_{ZC}^{RS}} \right)}},{0 \leq n \leq M_{SC}^{MS}}} & \left\lbrack {{Math}.\mspace{14mu} 2} \right\rbrack\end{matrix}$

Here, the q-th root Zadoff-Chu sequence x_(q)(m) is defined bymathematical expression 3.

$\begin{matrix}{{{x_{q}(m)} = {\mathbb{e}}^{{- j}\;\frac{\pi\;{qm}{({m + 1})}}{N_{ZC}^{RS}}}},{0 \leq m \leq {N_{ZC}^{RS} - 1}}} & \left\lbrack {{Math}.\mspace{14mu} 3} \right\rbrack\end{matrix}$

Here, q is given by mathematical expressions 4.

$\begin{matrix}{{q = {\left\lfloor {\overset{\_}{q} + {1/2}} \right\rfloor + {v \cdot \left( {- 1} \right)^{\lfloor{2\overset{\_}{q}}\rfloor}}}}{\overset{\_}{q} = {N_{ZC}^{RS} \cdot {\left( {u + 1} \right)/31}}}} & \left\lbrack {{Math}.\mspace{14mu} 4} \right\rbrack\end{matrix}$

Here, the Zadoff-Chu sequence length N_(ZC) ^(RS) is given by thelargest prime number that satisfies N_(ZC) ^(RS)<M_(SC) ^(RS).

In addition, the sequence group number u in the slot n_(s) is defined inaccordance with mathematical expression 5 using a group hopping patternf_(gh)(n_(s)) and a sequence shift pattern f_(ss).u=(f _(gh)(n _(s))+f _(ss))mod 30  [Math. 5]

Here, the base station can instruct the terminal to enable or disablethe sequence group hopping (also referred to simply as a group hopping).As described below, for example, in the case of a condition A, the basestation can provide instructions as to whether to enable or disable thesequence group hopping, on the basis of a cell-specific parameter. Inthe case of a condition B, the base station can provide instructions asto whether to enable or disable the sequence group hopping, on the basisof a terminal-specific (user-equipment-specific; UE-specific) parameter.The details of the conditions A and B will be described below.

For example, when instructed by the base station to enable the sequencegroup hopping, the terminal performs hopping on the groups of thereference signal sequence on a slot-by-slot basis. That is, the terminaldetermines whether to perform hopping on the groups of the referencesignal sequence on a slot-by-slot basis, in accordance with the enablingor disabling of the sequence group hopping.

Here, for example, the group hopping pattern f_(gh)(n_(s)) is given bymathematical expression 6.

$\begin{matrix}{{f_{gh}\left( n_{s} \right)} = \left\{ \begin{matrix}0 & {{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{disabled}} \\{\left( {\sum\limits_{i = 0}^{7}{{c\left( {{8n_{s}} + i} \right)} \cdot 2^{i}}} \right){mod}\; 30} & {{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{enabled}}\end{matrix} \right.} & \left\lbrack {{Math}.\mspace{14mu} 6} \right\rbrack\end{matrix}$

Here, a pseudo random sequence c(i) is defined by mathematicalexpressions 7. For example, the pseudo random sequence is defined by aGold sequence of length 31, and is given by mathematical expressions 7.c(n)=(x ₁(n+N _(C))+x ₂(n+N _(C)))mod 2x ₁(n+31)=(x ₁(n+3)+(n))mod 2x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod 2  [Math. 7]

Here, for example, N_(c)=1600. In addition, a first m-sequence x₁ isinitialized by x₁(0)=1 and x₁(n)=0, where n=1, 2, . . . , 30. Inaddition, a second m-sequence x₂ is initialized by mathematicalexpression 8.

$\begin{matrix}{c_{init} = {\sum\limits_{i = 0}^{30}{{x_{2}(i)} \cdot 2^{i}}}} & \left\lbrack {{Math}.\mspace{14mu} 8} \right\rbrack\end{matrix}$

Here, c_(init) is defined by mathematical expression 9. That is, thepseudo random sequence of the group hopping pattern f_(gh)(n_(s)) isinitialized by mathematical expression 9.

$\begin{matrix}{\left\lbrack {{Math}.\mspace{11mu} 9} \right\rbrack{c_{init} = \left\{ \begin{matrix}\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{284mu}(1)} \\\left\lfloor \frac{X}{30} \right\rfloor & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

The details of the physical layer cell identity N_(ID) ^(cell) and theparameter “X” will be described below.

In addition, the definition of the sequence shift pattern f_(ss) differsbetween the PUSCH and the PUCCH. For example, for the PUCCH, thesequence shift pattern f_(ss) ^(PUCCH) is given by mathematicalexpression 10. For the PUSCH, the sequence shift pattern f_(ss) ^(PUSCH)is given by mathematical expression 11.

$\begin{matrix}{\left\lbrack {{Math}.\; 10} \right\rbrack{f_{ss}^{PUCCH} = \left\{ \begin{matrix}{N_{ID}^{cell}\mspace{14mu}{mod}\mspace{14mu} 30} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{284mu}(1)} \\{X\mspace{14mu}{mod}\mspace{14mu} 30} & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix}\; \right.}} & \;\end{matrix}$

$\begin{matrix}{\left\lbrack {{Math}.\; 11} \right\rbrack{f_{ss}^{PUSCH} = \left\{ \begin{matrix}{\left( {f_{ss}^{PUCCH} + \Delta_{ss}} \right)\mspace{14mu}{mod}\mspace{14mu} 30} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{115mu}(1)} \\{\left( {f_{ss}^{PUCCH} + Y} \right)\mspace{25mu}{mod}\mspace{14mu} 30} & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

The details of the physical layer cell identity N_(ID) ^(cell) and theparameter “X” will be described below. The details of the parameterΔ_(ss) and the parameter “Y” will be described below.

In addition, the base sequence number v within the base sequence groupin the slot n_(s) is defined by mathematical expression 12. Here, thesequence hopping may be applied only to the reference signals whoselengths are greater than or equal to 6N_(SC) ^(RB). That is, the basesequence number ν is given by ν=0 for the reference signals whoselengths are less than 6N_(SC) ^(RB).

$\begin{matrix}{v = \left\{ \begin{matrix}{c\left( n_{s} \right)} & \begin{matrix}{{{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{disabled}}\mspace{14mu}} \\{{and}\mspace{14mu}{sequence}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{enabled}}\end{matrix} \\0 & {otherwise}\end{matrix} \right.} & \left\lbrack {{Math}.\mspace{14mu} 12} \right\rbrack\end{matrix}$

Here, the base station can instruct the terminal to enable or disablethe sequence hopping. As described below, for example, in the case ofthe condition A, the base station can provide instructions as to whetherto enable or disable the sequence hopping, on the basis of thecell-specific parameter. In the case of the condition B, the basestation can provide instructions as to whether to enable or disable thesequence hopping, on the basis of the UE-specific parameter. The detailsof the conditions A and B will be described below.

For example, when instructed by the base station to enable the sequencehopping, the terminal performs hopping on the sequences within a groupon a slot-by-slot basis. That is, the terminal determines whether toperform hopping on sequences within the group on a slot-by-slot basis,in accordance with the enabling or disabling of the sequence hopping.

Here, the pseudo random sequence c(i) is defined by mathematicalexpressions 7 and mathematical expression 8. In addition, c_(init) isdefined by mathematical expression 13. That is, the pseudo randomsequence of the base sequence number v is initialized by mathematicalexpression 13.

$\begin{matrix}{\left\lbrack {{Math}.\mspace{14mu} 13} \right\rbrack{c_{init} = \left\{ \begin{matrix}{{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{230mu}(1)} \\{{\left\lfloor \frac{X}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}} & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

The details of the physical cell identity N_(ID) ^(cell) and theparameter “X” will be described below.

An example of a method for generating a sequence of the first referencesignal will be discussed hereinafter. That is, a method for generatingthe demodulation reference signal for the PUSCH will be discussed. Forexample, a PUSCH demodulation reference signal sequence γ^((λ))_(PUSCH)(•) associated with Layers λε{0, 1, . . . , ν−1} is defined bymathematical expression 14.

$\begin{matrix}{{r_{PUSCH}^{(\lambda)}\left( {{m \cdot M_{SC}^{RS}} + n} \right)} = {{w^{(\lambda)}(m)}{r_{u,v}^{(\alpha_{\lambda})}(n)}}} & \left\lbrack {{Math}.\mspace{14mu} 14} \right\rbrack\end{matrix}$

Here, ν denotes the number of transmission layers. For example, m isrepresented as being equal to 0 or 1. In addition, n is represented asbeing equal to 0, . . . , or M_(SC) ^(RS)−1. In addition, M_(SC)^(RS)=M_(SC) ^(PUSCH), where M_(SC) ^(PUSCH) is a bandwidth scheduledfor uplink transmission (transmission on the PUSCH) by the base station,and is represented by, for example, the number of subcarriers.Furthermore, w^((λ))(m) denotes an orthogonal sequence.

In addition, the cyclic shift α_(λ) in the slot n_(s) is given byα_(λ)=2πn_(cs,λ). Here, n_(cs,λ) is represented by mathematicalexpression 15. That is, the cyclic shift applied to the first referencesignal associated with the PUSCH is defined by mathematical expression15.

$\begin{matrix}{n_{{cs},\lambda} = {\left( {n_{DMRS}^{(1)} + n_{{DMRS},\lambda}^{(2)} + {n_{PN}\left( n_{s} \right)}} \right){mod}\mspace{14mu} 12}} & \left\lbrack {{Math}.\mspace{14mu} 15} \right\rbrack\end{matrix}$

Here, n⁽¹⁾ _(DMRS) is signaled by the base station device using thehigher layer signaling. In addition, n⁽²⁾ _(DMRS,λ) is indicated by thebase station device using the DCI format. In addition, the quantityn_(PN)(n_(s)) is given by mathematical expression 16.

$\begin{matrix}{{n_{PN}\left( n_{s} \right)} = {\sum\limits_{i = 0}^{7}{{c\left( {{8{N_{symb}^{UL} \cdot n_{s}}} + i} \right)} \cdot 2^{i}}}} & \left\lbrack {{Math}.\mspace{14mu} 16} \right\rbrack\end{matrix}$

Here, the pseudo random sequence c(i) is defined by mathematicalexpressions 7 and mathematical expression 8. In addition, c_(init) isdefined by mathematical expression 17. That is, the cyclic shift appliedto the first reference signal associated with the PUSCH is initializedby mathematical expression 17.

$\begin{matrix}{\left\lbrack {{Math}.\mspace{14mu} 17} \right\rbrack{c_{init} = \left\{ \begin{matrix}{{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{284mu}(1)} \\Z & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

The details of the physical layer cell identity N_(ID) ^(cell) and theparameter “Z” will be described below.

An example of a method for generating a sequence of the second referencesignal will be discussed hereinafter. That is, a method for generatingthe demodulation reference signal for the PUCCH will be discussed. Forexample, a PUCCH demodulation reference signal sequence γ^((P))_(PUCCH)(•) is defined by mathematical expression 18.

$\begin{matrix}{{r_{PUCCH}^{(p)}\left( {{m^{\prime}N_{RS}^{PUCCH}M_{SC}^{RS}} + {mM}_{SC}^{RS} + n} \right)} = {\frac{1}{\sqrt{p}}{w^{(p)}(m)}{r_{u,v}^{(\alpha_{p})}(n)}}} & \left\lbrack {{Math}.\mspace{14mu} 18} \right\rbrack\end{matrix}$

Here, for example, m is represented as being equal to 0, . . . , orM_(RS) ^(PUCCH)−1. In addition, n is represented as being equal to 0, .. . , or M_(RS)−1. In addition, m′ is represented as being equal to 0or 1. Here, p is the number of antenna ports used for PUCCH transmission(transmission on the PUCCH). In addition, the sequence γ^((αp))_(u,v)(n) is given by mathematical expression 1, where, for example,M_(SC) ^(RS)=12.

Here, the cyclic shift α_(p)(n_(s),1) is given by mathematicalexpressions 19. That is, the cyclic shift applied to the secondreference signal associated with the PUCCH is defined by mathematicalexpressions 19.

$\begin{matrix}{{{{\overset{\_}{n}}_{oc}^{(p)}\left( n_{s} \right)} = \left\lfloor {{n_{p}^{\prime}\left( n_{s} \right)} \cdot {\Delta_{shift}^{PUCCH}/N^{\prime}}} \right\rfloor}{{\alpha_{p}\left( {n_{s},l} \right)} = {2{\pi \cdot {{{\overset{\_}{n}}_{cs}^{(p)}\left( {n_{s},l} \right)}/N_{SC}^{RB}}}}}{{n_{cs}^{(p)}\left( {n_{s},l} \right)} = \left\{ \begin{matrix}\begin{matrix}\left\lbrack {{n_{cs}^{cell}\left( {n_{s},l} \right)} + \left( {{{n_{p}^{\prime}\left( n_{s} \right)} \cdot \Delta_{shift}^{PUCCH}} +} \right.} \right. \\{\left. {\left. \left( {{\overset{\_}{n}}_{oc}^{(p)}\left( n_{s} \right){mod}\;\Delta_{shift}^{PUCCH}} \right) \right){mod}\mspace{14mu} N^{\prime}} \right\rbrack{mod}\mspace{14mu} N_{SC}^{RB}}\end{matrix} & {{for}\mspace{14mu}{normal}\mspace{14mu}{cyclic}\mspace{14mu}{prefix}} \\\begin{matrix}\left\lbrack {{n_{cs}^{cell}\left( {n_{s},l} \right)} + \left( {{{n_{p}^{\prime}\left( n_{s} \right)} \cdot \Delta_{shift}^{PUCCH}} +} \right.} \right. \\{\left. {\left. {{\overset{\_}{n}}_{oc}^{(p)}\left( n_{s} \right)} \right){mod}\mspace{14mu} N^{\prime}} \right\rbrack{mod}\mspace{14mu} N_{SC}^{RB}}\end{matrix} & {{for}\mspace{14mu}{extended}\mspace{14mu}{c{yclic}}\mspace{14mu}{prefix}}\end{matrix} \right.}} & \left\lbrack {{Math}.\mspace{11mu} 19} \right\rbrack\end{matrix}$

Here, n′_(p)(n_(s)), N′, and Δ_(shift) ^(PUCCH) are determined on thebasis of information and so on signaled by the base station. Inaddition, the number of reference symbols per slot M_(RS) ^(PUCCH) andthe sequence w(n) are defined in accordance with the specifications andso on.

In addition, the cyclic shift n_(cs) ^(cell)(n_(s),1) is defined bymathematical expression 20.

$\begin{matrix}{{n_{cs}^{cell}\left( {n_{s},l} \right)} = {\sum\limits_{i = 0}^{7}{{c\left( {{8{N_{symb}^{UL} \cdot n_{s}}} + {8l} + i} \right)} \cdot 2^{i}}}} & \left\lbrack {{Math}.\mspace{14mu} 20} \right\rbrack\end{matrix}$

Here, N_(symb) ^(UL) is the number of symbols in an uplink slot (thenumber of SC-FDMA symbols). In addition, the pseudo random sequence c(i)is defined by mathematical expressions 7 and mathematical expression 8.In addition, c_(init) is defined by mathematical expression 21 ormathematical expression 22. That is, the cyclic shift applied to thesecond reference signal associated with the PUCCH is initialized bymathematical expression 21 or mathematical expression 22.

$\begin{matrix}{\left\lbrack {{Math}.\mspace{14mu} 21} \right\rbrack{c_{init} = \left\{ \begin{matrix}N_{ID}^{cell} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{284mu}(1)} \\X & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

$\begin{matrix}{\left\lbrack {{Math}.\mspace{14mu} 21} \right\rbrack{c_{init} = \left\{ \begin{matrix}N_{ID}^{cell} & {{if}\mspace{14mu}{condition}\mspace{14mu} A} & {\mspace{284mu}(1)} \\K & {{if}\mspace{14mu}{condition}\mspace{14mu} B} & (2)\end{matrix} \right.}} & \;\end{matrix}$

The details of the physical layer cell identity N_(ID) ^(cell) and theparameter “X” will be described below. The details of the parameter “K”will also be described below. Here, by defining c_(init) usingmathematical expression 21, it is possible to use the same parameter “X”for the generation of the first reference signal and the generation ofthe second reference signal. That is, the parameter “X” that is used forthe generation of the first reference signal can also be used for thegeneration of the second reference signal. The configuration ofparameters with efficient use of radio resources is feasible.

The cyclic shift applied to the PUCCH is generated using mathematicalexpression 20. In addition, c_(init) is defined by mathematicalexpression 21 or mathematical expression 22. That is, the terminal cantransmit on the PUCCH the uplink signal generated using mathematicalexpression 20 and mathematical expression 21. Alternatively, theterminal can transmit on the PUCCH the uplink signal generated usingmathematical expression 20 and mathematical expression 22.

In the mathematical expressions given above, N_(ID) ^(cell) denotes aphysical layer cell identity (also referred to as a physical layer cellidentifier). That is, N_(ID) ^(cell) denotes a cell (base station)specific (cell (base station) unique) identity. That is, N_(ID) ^(cell)denotes a physical layer identity of a cell. For example, N_(ID) ^(cell)may be N_(ID) ^(cell) corresponding to the primary cell.

For example, the terminal can detect N_(ID) ^(cell) usingsynchronization signals. In addition, the terminal can acquire N_(ID)^(cell) from information included in the higher layer signaling (e.g.,hand over command) transmitted from the base station.

That is, N_(ID) ^(cell) is a parameter related to the reference signalsequence (a parameter related to the generation of the reference signalsequence). That is, N_(ID) ^(cell) is a parameter related to the firstreference signal (a parameter related to the generation of the sequenceof the first reference signal). In addition, N_(ID) ^(cell) is aparameter related to the second reference signal (a parameter related tothe generation of the sequence of the second reference signal). Inaddition, N_(ID) ^(cell) is a parameter related to the PUCCH (aparameter related to the generation of the uplink signal to betransmitted on the PUCCH).

In the mathematical expressions given above, additionally, for example,the parameter Δ_(ss) is denoted by Δ_(ss)ε{0, 1, . . . , 29}. Theparameter Δ_(ss) is a cell (base station) specific parameter. Forexample, the terminal can receive the parameter Δ_(ss) using SIB2(System Information Block Type2). SIB2 is a configuration common to(information common to) all the terminals (or, instead, a plurality ofterminals) within a cell.

That is, the terminal uses information common to all the terminalswithin the cell to specify the parameter Δ_(ss). That is, the parameterΔ_(ss) is a parameter related to the first reference signal.

In the mathematical expressions given above, additionally, the parameter“X” (the value of the parameter “X”) denotes a virtual cell identity(also referred to as a virtual cell identifier). That is, the parameter“X” denotes a UE-specific identity. That is, the parameter “X” denotes aUE-specific parameter.

That is, the parameter “X” is a parameter related to the referencesignal sequence. That is, the parameter “X” is a parameter related tothe first reference signal. In addition, the parameter “X” is aparameter related to the second reference signal. In addition, theparameter “X” is a parameter related to the PUCCH.

In the mathematical expressions given above, additionally, for example,the parameter “Y” (the value of the parameter “Y”) is denoted by “Y”ε{0,1, . . . , 29}. Here, the parameter “Y” denotes a UE-specific parameter.That is, the parameter “Y” is a parameter related to the first referencesignal.

In the mathematical expressions given above, additionally, the parameter“Z” (the value of the parameter “Z”) denotes the initial value of thesecond m-sequence. Here, the parameter “Z” denotes a UE-specificparameter. That is, the parameter “Z” is a parameter related to thefirst reference signal.

In the mathematical expressions given above, additionally, the parameter“K” (the value of the parameter “K”) denotes the initial value of thesecond m-sequence. Here, the parameter “K” denotes a UE-specificparameter. That is, the parameter “K” is a parameter related to thePUCCH.

Here, the base station can provide instructions as to whether to enableor disable the sequence group hopping and/or the sequence hopping, usingthe parameter “M” (the value of the parameter “M”). For example, in acase where the sequence group hopping and/or the sequence hopping areenabled, the parameter “M” is set to “1”. In a case where the sequencegroup hopping and/or the sequence hopping are disabled, the parameter“M” is set to “0”. The parameter “M” denotes a UE-specific parameter.

That is, the parameter “M” is a parameter related to the referencesignal sequence. That is, the parameter “M” is a parameter related tothe first reference signal. In addition, the parameter “M” is aparameter related to the second reference signal.

Here, the base station can configure the parameter “X” to the terminalusing the higher layer signaling. For example, the base station canconfigure the parameter “X” by using the dedicated signal. The basestation may configure a plurality of parameters “X” by using thededicated signal, and indicate one parameter “X” among the configuredplurality of parameters “X” using downlink control informationtransmitted on the PDCCH (e.g., using the information regarding the basesequence index or using the base sequence index associated with thePUCCH).

That is, downlink control information for indicating the parameter “X”is included in the uplink grant. Downlink control information forindicating the parameter “X” may be included in the downlink assignment.

For example, the base station can configure (X₀) and (X₁) as theplurality of parameters “X”, and indicate (X₀) or (X₁) using downlinkcontrol information (e.g., 1-bit information) transmitted on the PDCCH.

In addition, the base station can configure the parameter “Y” to theterminal using the higher layer signaling. For example, the base stationcan configure the parameter “Y” by using the dedicated signal. The basestation may configure a plurality of parameters “Y” by using thededicated signal, and indicate one parameter “Y” among the configuredplurality of parameters “Y” using downlink control informationtransmitted on the PDCCH (e.g., using the information regarding the basesequence index). That is, downlink control information for indicatingthe parameter “Y” is included in the uplink grant.

For example, the base station can configure (Y₀) and (Y₁) as theplurality of parameters “Y”, and indicate (Y₀) or (Y₁) using downlinkcontrol information (e.g., 1-bit information) transmitted on the PDCCH.

In addition, the base station can configure the parameter “Z” to theterminal using the higher layer signaling. For example, the base stationcan configure the parameter “Z” by using the dedicated signal. The basestation may configure a plurality of parameters “Z” by using thededicated signal, and indicate one parameter “Z” among the configuredplurality of parameters “Z” using downlink control informationtransmitted on the PDCCH (e.g., using the information regarding the basesequence index). That is, downlink control information for indicatingthe parameter “Z” is included in the uplink grant.

For example, the base station can configure (Z₀) and (Z₁) as theplurality of parameters “Z”, and indicate (Z₀) or (Z₁) using downlinkcontrol information (e.g., 1-bit information) transmitted on the PDCCH.

In addition, the base station can configure the parameter “K” to theterminal using the higher layer signaling. For example, the base stationcan configure the parameter “K” by using the dedicated signal. The basestation may configure a plurality of parameters “K” by using thededicated signal, and indicate one parameter “K” among the configuredplurality of parameters “K” using downlink control informationtransmitted on the PDCCH (e.g., using the information regarding the basesequence index associated with the PUCCH). Downlink control informationfor indicating the parameter “K” is included in the downlink assignment.

For example, the base station can configure (K₀) and (K₁) as theplurality of parameters “K”, and indicate (K₀) or (K₁) using downlinkcontrol information (e.g., 1-bit information) transmitted on the PDCCH.

In addition, the base station can configure the parameter “M” to theterminal using the higher layer signaling. For example, the base stationcan configure the parameter “M” by using the dedicated signal. The basestation may configure a plurality of parameters “M” by using thededicated signal, and indicate one parameter “M” among the configuredplurality of parameters “M” using downlink control informationtransmitted on the PDCCH (e.g., using information for givinginstructions to enable or disable the sequence group hopping and/or thesequence hopping). That is, downlink control information for indicatingthe parameter “M” is included in the uplink grant.

For example, the base station can configure (M₀) and (M₁) as theplurality of parameters “M”, and indicate (M₀) or (M₁) using downlinkcontrol information (e.g., 1-bit information) transmitted on the PDCCH.

Furthermore, the base station may configure a plurality of sets ofparameters “X” and/or parameters “Y” and/or parameters “Z” and/orparameters “K” and/or parameters “M” by using the dedicated signal, andindicate one set among the configured plurality of sets using downlinkcontrol information transmitted on the PDCCH (e.g., using theinformation regarding the base sequence index, using the informationregarding the base sequence index associated with the PUCCH, or usingthe information for giving instructions to enable or disable thesequence group hopping and/or the sequence hopping).

That is, downlink control information for indicating one set among theplurality of sets is included in the uplink grant. In addition, downlinkcontrol information for indicating one set from among the plurality ofsets may be included in the downlink assignment.

Here, the parameter “X”, the parameter “Y”, the parameter “Z”, theparameter “K”, and the parameter “M” may be independently configured.The parameter “X” and/or the parameter “Y” and/or the parameter “Z”and/or the parameter “K” may be configured in association with eachother. For example, by notifying the terminal of only the parameter “X”,the base station can indicate the parameter “Y” and/or the parameter “Z”and/or the parameter “K” and/or the parameter “M” associated with theparameter “X”.

For example, the association of the parameter “X” with the parameter “Y”and/or the parameter “Z” and/or the parameter “K” and/or the parameter“M” can be defined in advance in accordance with the specifications andso on, and can be set as information known between the base station andthe terminal.

In the following, a description is given of a set of parameters whichinclude the parameter “X”, the parameter “Y”, the parameter “Z”, and theparameter “K”, for ease of description. A similar embodiment may applyto a set of parameters which include the parameter “X” and/or theparameter “Y” and/or the parameter “Z” and/or the parameter

For example, the base station can configure (X₀, Y₀, Z₀, K₀) and (X₁,Y₁, Z₁, K₁) as a plurality of sets of parameters, and indicate (X₀, Y₀,Z₀, K₀) or (X₁, Y₁, Z₁, K₁) using downlink control information (e.g.,I-bit information) transmitted on the PDCCH.

In a case where the parameters (X₀, Y₀, Z₀, K₀) are indicate usingdownlink control information transmitted on the PDCCH, the terminalgenerates the first reference signal using the parameters (X₀, Y₀, Z₀,K₀). In a case where the parameters (X₁, Y₁, K₁) are indicated usingdownlink control information transmitted on the PDCCH, the terminalgenerates the first reference signal using the parameters (X₁, Y₁, Z₁,K₁).

In addition, in a case where the parameters (X₀, Y₀, Z₀, K₀) areindicated using downlink control information transmitted on the PDCCH,the terminal generates the second reference signal using the parameters(X₀, Y₀, Z₀, K₀). In a case where the parameters (X₁, Y₁, Z₁, K₁) areindicated using downlink control information transmitted on the PDCCH,the terminal generates the second reference signal using the parameters(X₁, Y₁, Z₁, K₁).

Here, the base station can transmit the parameter “M” by including theparameter “M” in each set of parameters. That is, the base station canprovide, for each set of parameters, instructions as to whether toenable or disable the sequence group hopping and/or the sequencehopping. For example, the base station can configure (X₀, Y₀, Z₀, M₀=“1”(enabling)) and (X₁, Y₁, Z₁, M₁=“0” (disabling)) as a plurality of setsof parameters, and indicate (X₀, Y₀, Z₀, M₀=“1” (enabling)) or (X₁, Y₁,Z₁, M₁=“0” (disabling)) using downlink control information (e.g., 1-bitinformation) transmitted on the PDCCH.

In a case where the parameters (X₀, Y₀, Z₀, M₀=“1” (enabling)) areindicated using downlink control information transmitted on the PDCCH,the terminal generates the first reference signal using the parameters(X₀, Y₀, Z₀) while enabling the sequence group hopping. In a case wherethe parameters (X₁, Y₁, Z₁, M₁=“0” (disabling)) are indicated usingdownlink control information transmitted on the PDCCH, the terminalgenerates the first reference signal using the parameters (X₁, Y₁, Z₁)while disabling the sequence group hopping.

In the following, downlink control information for indicating theparameter “X” and/or downlink control information for indicating theparameter “Y” and/or downlink control information for indicating theparameter “Z” and/or downlink control information for indicating theparameter “K” and/or downlink control information for indicating the setof parameters are described as downlink control information forindicating parameters, for ease of description.

Here, the downlink control information for indicating parameters may beincluded in the uplink grant only when the parameters are configured bythe base station using the higher layer signaling. In addition, thedownlink control information for indicating the parameters may beincluded in the downlink assignment only when the parameters areconfigured by the base station using the higher layer signaling.

For example, the base station may indicate whether the downlink controlinformation for indicating the parameters is included in the uplinkgrant, by using the dedicated signal. The base station may indicatewhether the downlink control information for indicating the parametersis included in the downlink assignment, by using the dedicated signal.

In addition, the base station may indicate whether the downlink controlinformation for indicating the parameters is included in the uplinkgrant, by configuring a downlink transmission mode (e.g., a PDSCHtransmission mode) and/or an uplink transmission mode (e.g., a PUSCHtransmission mode) by using the dedicated signal. The base station mayindicate whether the downlink control information for indicating theparameters is included in the downlink assignment, by configuring thedownlink transmission mode and/or the uplink transmission mode by usingthe dedicated signal.

That is, the terminal can identify the downlink control information forindicating the parameters as being included in the uplink grant onlywhen a specific downlink transmission mode and/or a specific uplinktransmission mode are configured. In addition, the terminal can identifythe downlink control information for indicating the parameters as beingincluded in the downlink assignment only when the specific downlinktransmission mode and/or the specific uplink transmission mode areconfigured.

The specific downlink transmission mode and/or the uplink transmissionmode can be defined in advance in accordance with the specifications andso on, and can be set as information known between the base station andthe terminal.

In addition, the base station may perform configuration (giveinstructions) to include in the uplink grant the downlink controlinformation for indicating the parameters and to include in the downlinkassignment the downlink control information for indicating theparameters, by using a single piece of information. For example, thebase station may transmit the single piece of information by using thededicated signal. In addition, the base station may transmit thedownlink transmission mode and/or the uplink transmission mode as thesingle piece of information.

In addition, the base station may include the downlink controlinformation for indicating the parameters only in the uplink granttransmitted in the user-equipment-specific search space. In addition,the base station may include the downlink control information forindicating the parameters only in the downlink assignment transmitted inthe user-equipment-specific search space.

In addition, default values may be configured in the downlink controlinformation for indicating the parameters. That is, the terminal may usethe default values until parameters are configured by the base station.The default values can be defined in advance in accordance with thespecifications and so on, and can be set as information known betweenthe base station and the terminal.

For example, the default value of the parameter “X” may be equal toN_(ID) ^(cell). In addition, the default value of the parameter “Y” maybe the value of the parameter Δ_(ss). The default value of the parameter“Y” may be specified by the base station using SIB2. The default valueof the parameter “Y” may be equal to “0”. The default value of theparameter “Z” may be calculated in accordance with mathematicalexpression 17(1). In mathematical expression 17(1), f_(ss) ^(PUSCH) maybe calculated on the basis of the parameter Δ_(ss) specified by the basestation using SIB2. In addition, the default value of the parameter “K”may be equal to N_(ID) ^(cell) (e.g., N_(ID) ^(cell) corresponding tothe primary cell). In addition, the default value of the parameter “M”may be equal to “disabling”.

In the following, the physical layer cell identity N_(ID) ^(eell) and/orthe parameter Δ_(ss) are also represented as first parameters. Inaddition, the parameter “X” and/or the parameter “Y” and/or theparameter “Z” and/or the parameter “K” and/or the parameter “M” are alsorepresented as second parameters.

As illustrated in FIG. 5, the terminal identifies a condition, andswitches parameters related to the first reference signal (or, instead,related to the generation of the sequence of the first reference signal)on the basis of the condition. Specifically, if the condition is A, theterminal generates the first reference signal using the first parametersin the mathematical expressions given above.

In addition, the terminal identifies the condition, and switchesparameters related to the second reference signal (or, instead, relatedto the generation of the sequence of the second reference signal) on thebasis of the condition. Specifically, if the condition is A, theterminal generates the second reference signal using the firstparameters in the mathematical expressions given above.

In addition, the terminal identifies the condition, and switchesparameters related to the PUCCH (or, instead, related to the generationof the uplink signal to be transmitted on the PUCCH) on the basis of thecondition. Specifically, if the condition is A, the terminal generatesthe uplink signal to be transmitted on the PUCCH using the firstparameters in the mathematical expressions given above.

Specifically, if the condition is A, the terminal maps the firstreference signal (or, instead, part of the sequence of the firstreference signal) generated using the first parameters to resourceelements in the resource blocks allocated for PUSCH transmission(transmission on the PUSCH).

In addition, if the condition is A, the terminal maps the secondreference signal (or, instead, part of the sequence of the secondreference signal) generated using the first parameters to resourceelements in the resource blocks allocated for PUCCH transmission(transmission on the PUCCH).

In addition, if the condition is A, the terminal maps the uplink signalgenerated using the first parameters to resource elements in theresource blocks allocated for PUCCH transmission (transmission on thePUCCH).

In addition, the base station identifies the condition, and switchesparameters related to the first reference signal (or, instead, relatedto the generation of the sequence of the first reference signal) on thebasis of the condition. Specifically, if the condition is A, the basestation assumes that the first reference signal is generated using thefirst parameters in the mathematical expressions given above.

In addition, the base station identifies the condition, and switchesparameters related to the second reference signal (or, instead, relatedto the generation of the sequence of the second reference signal) on thebasis of the condition. Specifically, if the condition is A, the basestation assumes that the second reference signal is generated using thefirst parameters in the mathematical expressions given above.

In addition, the base station identifies the condition, and switchesparameters related to the PUCCH (or, instead, related to the generationof the uplink signal to be transmitted on the PUCCH) on the basis of thecondition. Specifically, if the condition is A, the base station assumesthat the uplink signal to be transmitted on the PUCCH is generated usingthe first parameters in the mathematical expressions given above.

Specifically, if the condition is A, the base station assumes that thefirst reference signal (or, instead, part of the sequence of the firstreference signal) generated using the first parameters is mapped toresource elements in the resource blocks allocated for PUSCHtransmission (transmission on the PUSCH).

In addition, if the condition is A, the base station assumes that thesecond reference signal (or, instead, part of the sequence of the secondreference signal) generated using the first parameters is mapped toresource elements in the resource blocks allocated for PUCCHtransmission (transmission on the PUCCH).

In addition, if the condition is A, the base station assumes that theuplink signal generated using the first parameters is mapped to resourceelements in the resource blocks allocated for PUCCH transmission(transmission on the PUCCH).

If the condition is B, the terminal generates the first reference signalusing the second parameters in the mathematical expressions given above.In addition, if the condition is B, the terminal generates the secondreference signal using the second parameters in the mathematicalexpressions given above. In addition, if the condition is B, theterminal generates the uplink signal to be transmitted on the PUCCHusing the second parameters in the mathematical expressions given above.

Specifically, if the condition is B, the terminal maps the firstreference signal (or, instead, part of the sequence of the firstreference signal) generated using the second parameters to resourceelements in the resource blocks allocated for PUSCH transmission(transmission on the PUSCH).

In addition, if the condition is B, the terminal maps the secondreference signal (or, instead, part of the sequence of the secondreference signal) generated using the second parameters to resourceelements in the resource blocks allocated for PUCCH transmission(transmission on the PUCCH).

In addition, if the condition is B, the terminal maps the uplink signalgenerated using the second parameters to resource elements in theresource blocks allocated for PUCCH transmission (transmission on thePUCCH).

In addition, if the condition is B, the base station assumes that thefirst reference signal is generated using the second parameters in themathematical expressions given above. In addition, if the condition isB, the terminal assumes that the second reference signal is generatedusing the second parameters in the mathematical expressions given above.In addition, if the condition is B, the terminal assumes that the uplinksignal to be transmitted on the PUCCH is generated using the secondparameters in the mathematical expressions given above.

Specifically, if the condition is B, the base station assumes that thefirst reference signal (or, instead, part of the sequence of the firstreference signal) generated using the second parameters is mapped toresource elements in the resource blocks allocated for PUSCHtransmission (transmission on the PUSCH).

In addition, if the condition is B, the base station assumes that thesecond reference signal (or, instead, part of the sequence of the secondreference signal) generated using the second parameters is mapped toresource elements in the resource blocks allocated for PUCCHtransmission (transmission on the PUCCH).

In addition, if the condition is B, the base station assumes that theuplink signal generated using the second parameters is mapped toresource elements in the resource blocks allocated for PUCCHtransmission (transmission on the PUCCH).

The condition A includes that the PDCCH is detected (decoded) in theCSS. Specifically, in a case where the PDCCH is detected in the CSS, theterminal transmits the first reference signal generated using the firstparameters. In addition, in a case where the PDCCH is detected in theCSS, the terminal transmits the second reference signal generated usingthe first parameters. In addition, in a case where the PDCCH is detectedin the CSS, the terminal transmits on the PUCCH the uplink signalgenerated using the first parameters.

In addition, in a case where the PDCCH is allocated in the CSS, the basestation receives the first reference signal generated using the firstparameters. In addition, in a case where the PDCCH is allocated in theCSS, the base station receives the second reference signal generatedusing the first parameters. In addition, in a case where the PDCCH isallocated in the CSS, the base station receives on the PUCCH the uplinksignal generated using the first parameters.

Specifically, in a case where the PDCCH is detected in the CSS, theterminal transmits the first reference signal generated using N_(ID)^(cell). In addition, in a case where the PDCCH is detected in the CSS,the terminal transmits the second reference signal generated usingN_(ID) ^(cell). In addition, in a case where the PDCCH is detected inthe CSS, the terminal transmits on the PUCCH the uplink signal generatedusing N_(ID) ^(cell). In addition, in a case where the PDCCH is detectedin the CSS, the terminal transmits the first reference signal generatedusing the parameter Δ_(ss).

The condition B includes that the PDCCH is detected (decoded) in theUSS. Specifically, in a case where the PDCCH is detected in the USS, theterminal transmits the first reference signal generated using the secondparameters. In addition, in a case where the PDCCH is detected in theUSS, the terminal transmits the second reference signal generated usingthe second parameters. In addition, in a case where the PDCCH isdetected in the USS, the terminal transmits on the PUCCH the uplinksignal generated using the second parameters.

In addition, in a case where the PDCCH is allocated in the USS, the basestation receives the first reference signal generated using the secondparameters. In addition, in a case where the PDCCH is allocated in theUSS, the base station receives the second reference signal generatedusing the second parameters. In addition, in a case where the PDCCH isallocated in the USS, the base station receives on the PUCCH the uplinksignal generated using the second parameters.

Specifically, in a case where the PDCCH is detected in the USS, theterminal transmits the first reference signal generated using theparameter “X”. In addition, in a case where the PDCCH is detected in theUSS, the terminal transmits the first reference signal generated usingthe parameter “Y”. In addition, in a case where the PDCCH is detected inthe USS, the terminal transmits the first reference signal generatedusing the parameter “Z”.

In addition, in a case where the PDCCH is detected in the USS, theterminal transmits the second reference signal generated using theparameter “X”. In addition, in a case where the PDCCH is detected in theUSS, the terminal transmits on the PUCCH the uplink signal generatedusing the parameter “X”. In addition, in a case where the PDCCH isdetected in the USS, the terminal transmits the second reference signalgenerated using the parameter “K”. In addition, in a case where thePDCCH is detected in the USS, the terminal transmits on the PUCCH theuplink signal generated using the parameter “K”.

Here, the downlink control information for indicating the parameters(e.g., the information regarding the base sequence index or theinformation regarding the base sequence index associated with the PUCCH)is transmitted on the PDCCH in the USS.

That is, the terminal transmits, to the base station, the firstreference signal generated using a different method (using a differentparameter) on the basis of the search space in which the PDCCH isdetected. That is, the terminal generates the first reference signalusing a different method on the basis of whether the PDCCH is detectedin the CSS or in the USS.

In addition, the terminal transmits, to the base station, the secondreference signal generated using a different method on the basis of thesearch space in which the PDCCH is detected. That is, the terminalgenerates the second reference signal using a different method on thebasis of whether the PDCCH is detected in the CSS or in the USS.

In addition, the terminal further transmits on the PUCCH the uplinksignal generated using a different method on the basis of the searchspace in which the PDCCH is detected. That is, the terminal transmits onthe PUCCH the uplink signal generated using a different method on thebasis of whether the PDCCH is detected in the CSS or in the USS.

In addition, the condition A includes that the PDCCH with the CRCscrambled by the Temporary C-RNTI is detected (decoded). Specifically,in a case where the PDCCH with the CRC scrambled by the Temporary C-RNTIis detected, the terminal transmits the first reference signal generatedusing the first parameters. In addition, in a case where the PDCCH withthe CRC scrambled by the Temporary C-RNTI is detected, the terminaltransmits the second reference signal generated using the firstparameters. In addition, in a case where the PDCCH with the CRCscrambled by the Temporary C-RNTI is detected, the terminal transmits onthe PUCCH the uplink signal generated using the first parameters.

In addition, in a case where the PDCCH with the CRC scrambled by theTemporary C-RNTI is allocated, the base station receives the firstreference signal generated using the first parameters. In addition, in acase where the PDCCH with the CRC scrambled by the Temporary C-RNTI isallocated, the base station receives the second reference signalgenerated using the first parameters. In addition, in a case where thePDCCH with the CRC scrambled by the Temporary C-RNTI is allocated, thebase station receives on the PUCCH the uplink signal generated using thefirst parameters.

Specifically, in a case where the PDCCH with the CRC scrambled by theTemporary C-RNTI is detected, the terminal transmits the first referencesignal generated using N_(ID) ^(cell). In addition, in a case where thePDCCH with the CRC scrambled by the Temporary C-RNTI is detected, theterminal transmits the second reference signal generated using N_(ID)^(cell). In addition, in a case where the PDCCH with the CRC scrambledby the Temporary C-RNTI is detected, the terminal transmits on the PUCCHthe uplink signal generated using N_(ID) ^(cell). In addition, in a casewhere the PDCCH with the CRC scrambled by the Temporary C-RNTI isdetected, the terminal transmits the first reference signal generatedusing the parameter Δ_(ss).

In addition, the condition B includes that the PDCCH with the CRCscrambled by the C-RNTI is detected (decoded). Specifically, in a casewhere the PDCCH with the CRC scrambled by the C-RNTI is detected, theterminal transmits the first reference signal generated using the secondparameters. In addition, in a case where the PDCCH with the CRCscrambled by the C-RNTI is detected, the terminal transmits the secondreference signal generated using the second parameters. In addition, ina case where the PDCCH with the CRC scrambled by the C-RNTI is detected,the terminal transmits on the PUCCH the uplink signal generated usingthe second parameters.

In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is allocated, the base station receives the first referencesignal generated using the second parameters. In addition, in a casewhere the PDCCH with the CRC scrambled by the C-RNTI is allocated, thebase station receives the second reference signal generated using thesecond parameters. In addition, in a case where the PDCCH with the CRCscrambled by the C-RNTI is allocated, the base station receives on thePUCCH the uplink signal generated using the second parameters.

Specifically, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected, the terminal transmits the first reference signalgenerated using the parameter “X”. In addition, in a case where thePDCCH with the CRC scrambled by the C-RNTI is detected, the terminaltransmits the first reference signal generated using the parameter “Y”.In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected, the terminal transmits the first reference signalgenerated using the parameter “Z”.

In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected, the terminal transmits the second reference signalgenerated using the parameter “X”. In addition, in a case where thePDCCH with the CRC scrambled by the C-RNTI is detected, the terminaltransmits on the PUCCH the uplink signal generated using the parameter“X”. In addition, in a case where the PDCCH with the CRC scrambled bythe C-RNTI is detected, the terminal transmits the second referencesignal generated using the parameter “K”. In addition, in a case wherethe PDCCH with the CRC scrambled by the C-RNTI is detected, the terminaltransmits on the PUCCH the uplink signal generated using the parameter“K”.

Here, the downlink control information for indicating the parameters(e.g., the information regarding the base sequence index or theinformation regarding the base sequence index associated with the PUCCH)is transmitted on the PDCCH with the CRC scrambled by the C-RNTI.

That is, the terminal transmits, to the base station, the firstreference signal generated using a different method (using a differentparameter) on the basis of the RNTI by which the CRC is scrambled. Thatis, the terminal generates the first reference signal using a differentmethod on the basis of whether the CRC is scrambled by the TemporaryC-RNTI or by the C-RNTI.

In addition, the terminal transmits, to the base station, the secondreference signal generated using a different method on the basis of theRNTI by which the CRC is scrambled. That is, the terminal generates thesecond reference signal using a different method on the basis of whetherthe CRC is scrambled by the Temporary C-RNTI or by the C-RNTI.

In addition, the terminal transmits on the PUCCH the uplink signalgenerated using a different method on the basis of the RNTI by which theCRC is scrambled. That is, the terminal generates a PUCCH signal using adifferent method on the basis of whether the CRC is scrambled by theTemporary C-RNTI or by the C-RNTI.

The condition A may also include that the PDCCH with the CRC scrambledby the C-RNTI or the Temporary C-RNTI is detected (decoded) in the CSS.Specifically, in a case where the PDCCH with the CRC scrambled by theC-RNTI or the Temporary C-RNTI is detected in the CSS, the terminaltransmits the first reference signal generated using the firstparameters. In addition, in a case where the PDCCH with the CRCscrambled by the C-RNTI or the Temporary C-RNTI is detected in the CSS,the terminal transmits the second reference signal generated using thefirst parameters. In addition, in a case where the PDCCH with the CRCscrambled by the C-RNTI or the Temporary C-RNTI is detected in the CSS,the terminal transmits on the PUCCH the uplink signal generated usingthe first parameters.

In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI or the Temporary C-RNTI is allocated in the CSS, the base stationreceives the first reference signal generated using the firstparameters. In addition, in a case where the PDCCH with the CRCscrambled by the C-RNTI or the Temporary C-RNTI is allocated in the CSS,the base station receives the second reference signal generated usingthe first parameters. In addition, in a case where the PDCCH with theCRC scrambled by the C-RNTI or the Temporary C-RNTI is allocated in theCSS, the base station receives on the PUCCH the uplink signal generatedusing the first parameters.

Specifically, in a case where the PDCCH with the CRC scrambled by theC-RNTI or the Temporary C-RNTI is detected in the CSS, the terminaltransmits the first reference signal generated using N_(ID) ^(cell). Inaddition, in a case where the PDCCH with the CRC scrambled by the C-RNTIor the Temporary C-RNTI is detected in the CSS, the terminal transmitsthe second reference signal generated using N_(ID) ^(cell). In addition,in a case where the PDCCH with the CRC scrambled by the C-RNTI or theTemporary C-RNTI is detected in the CSS, the terminal transmits on thePUCCH the uplink signal generated using N_(ID) ^(cell). In addition, ina case where the PDCCH with the CRC scrambled by the C-RNTI or theTemporary C-RNTI is detected in the CSS, the terminal transmits thefirst reference signal generated using the parameter Δ_(ss).

The condition B may also include that the PDCCH with the CRC scrambledby the C-RNTI is detected (decoded) in the USS. Here, for example, thePDCCH with the CRC scrambled by the Temporary C-RNTI is allocated onlyin the CSS. Specifically, in a case where the PDCCH with the CRCscrambled by the C-RNTI is detected in the USS, the terminal transmitsthe first reference signal generated using the second parameters. Inaddition, in a case where the PDCCH with the CRC scrambled by the C-RNTIis detected in the USS, the terminal transmits the second referencesignal generated using the second parameters. In addition, in a casewhere the PDCCH with the CRC scrambled by the C-RNTI is detected in theUSS, the terminal transmits on the PUCCH the uplink signal generatedusing the second parameters.

In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is allocated in the USS, the base station receives the firstreference signal generated using the second parameters. In addition, ina case where the PDCCH with the CRC scrambled by the C-RNTI is allocatedin the USS, the base station receives the second reference signalgenerated using the second parameters. In addition, in a case where thePDCCH with the CRC scrambled by the C-RNTI is allocated in the USS, thebase station receives on the PUCCH the uplink signal generated using thesecond parameters.

Specifically, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected in the USS, the terminal transmits the firstreference signal generated using the parameter “X”. In addition, in acase where the PDCCH with the CRC scrambled by the C-RNTI is detected inthe USS, the terminal transmits the first reference signal generatedusing the parameter “Y”. In addition, in a case where the PDCCH with theCRC scrambled by the C-RNTI is detected in the USS, the terminaltransmits the first reference signal generated using the parameter “Z”.

In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected in the USS, the terminal transmits the secondreference signal generated using the parameter “X”. In addition, in acase where the PDCCH with the CRC scrambled by the C-RNTI is detected inthe USS, the terminal transmits on the PUCCH the uplink signal generatedusing the parameter “X”. In addition, in a case where the PDCCH with theCRC scrambled by the C-RNTI is detected in the USS, the terminaltransmits the second reference signal generated using the parameter “K”.In addition, in a case where the PDCCH with the CRC scrambled by theC-RNTI is detected in the USS, the terminal transmits on the PUCCH theuplink signal generated using the parameter “K”.

Here, the downlink control information for indicating the parameters(e.g., the information regarding the base sequence index or theinformation regarding the base sequence index associated with the PUCCH)is transmitted on the PDCCH, in the USS, with the CRC scrambled by theC-RNTI.

That is, the terminal transmits, to the base station, the firstreference signal generated using a different method (using a differentparameter) on the basis of the search space in which the PDCCH isdetected and on the basis of the RNTI by which the CRC is scrambled. Inaddition, the terminal transmits, to the base station, the secondreference signal generated using a different method on the basis of thesearch space in which the PDCCH is detected and on the basis of the RNTIby which the CRC is scrambled. In addition, the terminal transmits onthe PUCCH the uplink signal generated using a different method on thebasis of the search space in which the PDCCH is detected and on thebasis of the RNTI by which the CRC is scrambled.

In addition, the condition A includes that a predetermined DCI format(hereinafter referred to as a first DCI format) is received (detected,decoded). The first DCI format may be information that is defined inadvance in accordance with the specifications and so on and that isknown between the base station and the terminal. For example, the firstDCI format includes the DCI format 0. The DCI format 0 is transmitted onthe PDCCH in the CSS and/or the USS.

That is, in a case where the first DCI format is received, the terminaltransmits the first reference signal generated using the firstparameters. In addition, in a case where the first DCI format isreceived, the terminal transmits the second reference signal generatedusing the first parameters. In addition, in a case where the first DCIformat is received, the terminal transmits on the PUCCH the uplinksignal generated using the first parameters.

In addition, in a case where the first DCI format is transmitted, thebase station receives the first reference signal generated using thefirst parameters. In addition, in a case where the first DCI format istransmitted, the base station receives the second reference signalgenerated using the first parameters. In addition, in a case where thefirst DCI format is transmitted, the base station receives on the PUCCHthe uplink signal generated using the first parameters.

Specifically, in a case where the first DCI format is received, theterminal transmits the first reference signal generated using N_(ID)^(cell). In addition, in a case where the first DCI format is received,the terminal transmits the second reference signal generated usingN_(ID) ^(cell). In addition, in a case where the first DCI format isreceived, the terminal transmits on the PUCCH the uplink signalgenerated using N_(ID) ^(cell). In addition, in a case where the firstDCI format is received, the terminal transmits the first referencesignal generated using the parameter Δ_(ss).

In addition, the condition B includes that a DCI format other than thepredetermined DCI format (hereinafter referred to as a second DCIformat) is received (detected). For example, the second DCI formatincludes the DCI format 4. The DCI format 4 is transmitted on only thePDCCH in the USS.

That is, in a case where the second DCI format is received, the terminaltransmits the first reference signal generated using the secondparameters. In addition, in a case where the second DCI format isreceived, the terminal transmits the second reference signal generatedusing the second parameters. In addition, in a case where the second DCIformat is received, the terminal transmits on the PUCCH the uplinksignal generated using the second parameters.

In addition, in a case where the second DCI format is transmitted, thebase station receives the first reference signal generated using thesecond parameters. In addition, in a case where the second DCI format istransmitted, the base station receives the second reference signalgenerated using the second parameters. In addition, in a case where thesecond DCI format is transmitted, the base station receives on the PUCCHthe uplink signal generated using the second parameters.

Specifically, in a case where the second DCI format is received, theterminal transmits the first reference signal generated using theparameter “X”. In addition, in a case where the second DCI format isreceived, the terminal transmits the first reference signal generatedusing the parameter “Y”. In addition, in a case where the second DCIformat is received, the terminal transmits the first reference signalgenerated using the parameter “Z”.

In addition, in a case where the second DCI format is received, theterminal transmits the second reference signal generated using theparameter “X”. In addition, in a case where the second DCI format isreceived, the terminal transmits on the PUCCH the uplink signalgenerated using the parameter “X”. In addition, in a case where thesecond DCI format is received, the terminal transmits the secondreference signal generated using the parameter “K”. In addition, in acase where the second DCI format is received, the terminal transmits onthe PUCCH the uplink signal generated using the parameter “K”.

Here, the downlink control information for indicating the parameters(e.g., the base sequence index or the base sequence index associatedwith the PUCCH) is included in the second DCI format and is transmitted.

That is, the terminal transmits, to the base station, the firstreference signal generated using a different method (using a differentparameter) on the basis of the received DCI format. In addition, theterminal transmits, to the base station, the second reference signalgenerated using a different method on the basis of the received DCIformat. In addition, the terminal performs transmission on the PUCCHgenerated using a different method on the basis of the received DCIformat.

That is, the terminal transmits a first reference signal generated usinga different method (using a different parameter) on the basis of the DCIformat, the search space in which a PDCCH has been detected, and theRNTI scrambled with the CRC to the base station.

In addition, the terminal transmits, to the base station, the secondreference signal generated using a different method on the basis of theDCI format, the search space in which the PDCCH is detected, and theRNTI by which the CRC is scrambled.

In addition, the terminal transmits on the PUCCH the uplink signalgenerated using a different method on the basis of the DCI format, thesearch space in which the PDCCH is detected, and the RNTI by which theCRC is scrambled.

In addition, the condition A includes that an initial transmission ofthe transport block (UL-SCH or uplink transport block) on the PUSCHscheduled by the random access response grant is performed.

That is, in a case where the initial transmission of the transport blockon the PUSCH scheduled by the random access response grant is performed,the terminal transmits the first reference signal generated using thefirst parameters.

In addition, the terminal can identify the condition, and switch betweengeneration of the first reference signal (generation of the sequence ofthe first reference signal) based on a third parameter and generation ofthe first reference signal based on a fourth parameter. Specifically, ifthe condition is A, the terminal generates the first reference signal onthe basis of the third parameter. If the condition is B, the terminalgenerates the first reference signal on the basis of the fourthparameter. The condition A and the condition B are as described above.

The third parameter is a parameter that is configured to becell-specific. For example, the third parameter is specified using SIB2.For example, the third parameter includes the information regarding theenabling or disabling of the sequence group hopping. In addition, thethird parameter includes the information regarding the enabling ordisabling of the sequence hopping.

The fourth parameter is a parameter that is configured to beUE-specific. For example, the fourth parameter is indicated using theDCI format. The fourth parameter may also be configured using thededicated signal. For example, the fourth parameter includes theconfiguration regarding the enabling or disabling of the sequence grouphopping. In addition, the fourth parameter includes the informationregarding the enabling or disabling of the sequence hopping. That is,the fourth parameter includes the parameter “M” described above.

For example, if the condition is A, the terminal enables or disables thesequence group hopping on the basis of the third parameter (the value ofthe third parameter), and generates the first reference signal.Specifically, if the condition is A, the terminal determines whether toperform hopping on the groups of the first reference signal sequence ona slot-by-slot basis on the basis of the third parameter.

If the condition is A, additionally, the terminal enables or disablesthe sequence hopping on the basis of the third parameter (the value ofthe third parameter), and generates the first reference signal.Specifically, if the condition is A, the terminal determines whether toperform hopping on the sequences of the first reference signal withinthe group on a slot-by-slot basis on the basis of the third parameter.

If the condition is B, the terminal enables or disables the sequencegroup hopping on the basis of the fourth parameter (the value of thefourth parameter), and generates the first reference signal.Specifically, if the condition is B, the terminal determines whether toperform hopping on the groups of the first reference signal sequence ona slot-by-slot basis on the basis of the fourth parameter.

If the condition is B, additionally, the terminal enables or disablesthe sequence hopping on the basis of the fourth parameter (the value ofthe fourth parameter), and generates the first reference signal.Specifically, if the condition is B, the terminal determines whether toperform hopping on the sequences of the first reference signal withinthe group on a slot-by-slot basis on the basis of the fourth parameter.

In addition, the base station can identify the condition, and switchbetween the assumption that the first reference signal is generated (thesequence of the first reference signal is generated) on the basis of thethird parameter and the assumption that the first reference signal isgenerated on the basis of the fourth parameter. Specifically, if thecondition is A, the base station assumes that the first reference signalis generated on the basis of the third parameter. If the condition is B,the base station assumes that the first reference signal is generated onthe basis of the fourth parameter. The condition A and the condition Bare as described above.

For example, if the condition is A, the base station enables or disablesthe sequence group hopping on the basis of the third parameter (thevalue of the third parameter), and receives the first reference signal.If the condition is A, additionally, the base station enables ordisables the sequence hopping on the basis of the third parameter (thevalue of the third parameter), and receives the first reference signal.

If the condition is B, the base station enables or disables the sequencegroup hopping on the basis of the fourth parameter (the value of thefourth parameter), and receives the first reference signal. If thecondition is B, additionally, the base station enables or disables thesequence hopping on the basis of the fourth parameter (the value of thefourth parameter), and receives the first reference signal.

Specifically, in a case where the PDCCH is detected in the CSS, theterminal determines whether to perform hopping on the groups of thereference signal sequence on a slot-by-slot basis on the basis of thethird parameter. In a case where the PDCCH is detected in the USS, theterminal determines whether to perform hopping on the groups of thereference signal sequence on a slot-by-slot basis on the basis of thefourth parameter.

In addition, in a case where the PDCCH is allocated in the CSS, the basestation configures whether to perform hopping on the groups of thereference signal sequence on a slot-by-slot basis on the basis of thethird parameter. In a case where the PDCCH is allocated in the USS, thebase station configures whether to perform hopping on the groups of thereference signal sequence on a slot-by-slot basis on the basis of thefourth parameter.

The reference signal sequence includes the sequence of the demodulationreference signal associated with transmission of the PUSCH. In addition,the third parameter is configured to be cell-specific. In addition, thefourth parameter is configured to be terminal-specific(user-equipment-specific; UE-specific).

Using the method described above, it is possible to transmit and receivethe reference signals while, for example, more flexibly switchingbetween the sequences. In addition, using the method described above, itis possible to transmit and receive the reference signals while moredynamically switching between the sequences.

For example, it is possible to transmit and receive the referencesignals using the condition A within a period during which the basestation and the terminal perform configuration in the RRC layer. Thatis, it is possible to transmit and receive the reference signals usingthe condition A within a period during which ambiguous (unclear)configurations are provided (a period during which configurations areinconsistent between the base station and the terminal), which occurs inthe configuration in the RRC layer.

As described above, in the case of the condition A, the terminalgenerates the reference signals using the cell-specific parameters. Thatis, continuous communication is possible even within a period duringwhich the base station and the terminal perform configuration in the RRClayer, and it is possible to achieve communication with efficient use ofradio resources.

In addition, using the method described above, it is possible totransmit and receive the uplink signal while, for example, more flexiblyswitching between the sequences. In addition, using the method describedabove, it is possible to transmit and receive the uplink signal whilemore dynamically switching between the sequences.

For example, it is possible to transmit and receive the uplink signalusing the condition A within a period during which the base station andthe terminal perform configuration in the RRC layer. That is, it ispossible to transmit and receive the uplink signal using the condition Awithin a period during which ambiguous (unclear) configurations areprovided (a period during which configurations are inconsistent betweenthe base station and the terminal), which occurs in the configuration inthe RRC layer.

As described above, in the case of the condition A, the terminalgenerates the uplink signal using the cell-specific parameters. That is,continuous communication is possible even within a period during whichthe base station and the terminal perform configuration in the RRClayer, and it is possible to achieve communication with efficient use ofradio resources.

A program executable on a primary base station, a secondary basestation, and a terminal according to the present invention is a program(a program for causing a computer to function) for controlling a CPU andso on to implement the functions in the foregoing embodiments accordingto the present invention. Information handled by these devices istemporarily accumulated in a RAM when it is processed, and is thenstored in various ROMs or HDDs. The program is read, modified, andwritten by the CPU, as necessary. A recording medium storing the programmay be a semiconductor medium (e.g., a ROM, a non-volatile memory card,etc.), an optical recording medium (e.g., a DVD, an MO, an MD, a CD, aBD, etc.), or a magnetic recording medium (e.g., a magnetic tape, aflexible disk, etc.). Furthermore, the loaded program is executed toimplement the functions in the embodiments described above. In addition,in some cases, the functions in the present invention may be implementedby processing, in accordance with the instructions of the program, theprogram in cooperation with an operating system, any other applicationprogram, or the like.

In order to distribute the program in a market, the program may bestored in portable recording media for distribution, or may betransferred to a server computer connected via a network such as theInternet. In this case, a storage device in the server computer is alsoembraced by the present invention. In addition, part or all of a primarybase station, a secondary base station, and a terminal in theembodiments described above may be implemented as an LSI, which istypically an integrated circuit. The respective functional blocks of theprimary base station, the secondary base station, and the terminal maybe built into individual chips, or some or all of them may be integratedand built into a chip. The implementation of the method for forming anintegrated circuit is not limited to LSI, and the method may beimplemented by dedicated circuitry, a general-purpose processor, or thelike. Additionally, in the case of the advent of integrated circuittechnology replacing LSI due to the advancement of semiconductortechnology, it is also possible to use an integrated circuit based onthis technology.

While embodiments of this invention have been described in detail withreference to the drawings, specific configurations are not limited tothose of the embodiments, and any design changes and the like can bemade without departing from the scope of this invention. Additionally, avariety of changes can be made to the present invention within theclaims thereof, and embodiments obtained by combining technical meansdisclosed in different embodiments, as appropriate, are also within thetechnical scope of the present invention. Configurations includingelements that are described in the foregoing embodiments, in whichelements achieving similar advantages are interchanged, are alsoencompassed by the present invention.

INDUSTRIAL APPLICABILITY

The present invention is suitable for a mobile station device, a basestation device, a communication method, a wireless communication system,and an integrated circuit.

DESCRIPTION OF REFERENCE NUMERALS

-   -   100 base station    -   101 data control unit    -   102 transmit data modulation unit    -   103 radio unit    -   104 scheduling unit    -   105 channel estimation unit    -   106 received data demodulation unit    -   107 data extraction unit    -   108 higher layer    -   109 antenna    -   200 terminal    -   201 data control unit    -   202 transmit data modulation unit    -   203 radio unit    -   204 scheduling unit    -   205 channel estimation unit    -   206 received data demodulation unit    -   207 data extraction unit    -   208 higher layer    -   209 antenna    -   301 primary base station    -   302 secondary base station    -   303, 304 terminal    -   305, 306, 307, 308 uplink

The invention claimed is:
 1. A terminal device comprising: receivingcircuitry configured to receive a first parameter indicating that asequence group hopping is enabled or disabled; and transmittingcircuitry configured to transmit a demodulation reference signalassociated with transmission of a physical uplink shared channel, ademodulation reference signal sequence of the demodulation referencesignal being given by a sequence group number and a value related to acyclic shift, the sequence group number being given by a secondparameter, the value related to the cyclic shift being given by a thirdparameter, wherein a value of the second parameter is given by a valueof first information configured by a higher layer in a case that thevalue of the first information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds todownlink control information to which Cyclic Redundancy Check (CRC)parity bits scrambled by a Cell-Radio Network Temporary Identifier(C-RNTI) are attached, and the sequence group hopping is enabled, thevalue of the second parameter is given by a physical layer cell identityin a case that no value of the first information is configured by thehigher layer and the sequence group hoping is enabled, the value of thesecond parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto a random access response grant and the sequence group hopping isenabled, a value of the third parameter is given by a value of secondinformation configured by the higher layer in a case that the value ofthe second information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds to thedownlink control information to which the CRC parity bits scrambled bythe C-RNTI are attached, the value of the third parameter is given bythe physical layer cell identity in a case that no value of the secondinformation is configured by the higher layer, and the value of thethird parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto the random access response grant.
 2. The terminal device according toclaim 1, wherein the value of the second parameter is zero in a casethat the sequence group hopping is disabled.
 3. The terminal deviceaccording to claim 1, wherein the transmission of the physical uplinkshared channel that corresponds to the random access response grant isused for a transmission of a message 3 in a random access procedure. 4.The terminal device according to claim 1, wherein the value of thesecond parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto the downlink control information to which the CRC parity bitsscrambled by a temporary C-RNTI are attached and the sequence grouphopping is enabled, and the value of the third parameter is given by thephysical layer cell identity in a case that the transmission of thephysical uplink shared channel corresponds to the downlink controlinformation to which the CRC parity bits scrambled by the temporaryC-RNTI are attached and the sequence group hopping is enabled.
 5. Theterminal device according to claim 4, wherein the transmission of thephysical uplink shared channel that corresponds to the downlink controlinformation to which the CRC parity bits scrambled by the temporaryC-RNTI are attached is used for a retransmission of a transport block ina random access procedure.
 6. A base station device comprising:transmitting circuitry configured to transmit a first parameterindicating that a sequence group hopping is enabled or disabled; andreceiving circuitry configured to receive a demodulation referencesignal associated with transmission of a physical uplink shared channel,a demodulation reference signal sequence of the demodulation referencesignal being given by a sequence group number and a value related to acyclic shift, the sequence group number being given by a secondparameter, the value related to the cyclic shift being given by a thirdparameter, wherein a value of the second parameter is given by a valueof first information configured by a higher layer in a case that thevalue of the first information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds todownlink control information to which Cyclic Redundancy Check (CRC)parity bits scrambled by a Cell-Radio Network Temporary Identifier(C-RNTI) are attached, and the sequence group hopping is enabled, thevalue of the second parameter is given by a physical layer cell identityin a case that no value of the first information is configured by thehigher layer and the sequence group hoping is enabled, the value of thesecond parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto a random access response grant and the sequence group hopping isenabled, a value of the third parameter is given by a value of secondinformation configured by the higher layer in a case that the value ofthe second information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds to thedownlink control information to which the CRC parity bits scrambled bythe C-RNTI are attached, the value of the third parameter is given bythe physical layer cell identity in a case that no value of the secondinformation is configured by the higher layer, and the value of thethird parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto the random access response grant.
 7. The base station deviceaccording to claim 6, wherein the value of the second parameter is zeroin a case that the sequence group hopping is disabled.
 8. The basestation device according to claim 6, wherein the transmission of thephysical uplink shared channel that corresponds to the random accessresponse grant is used for a transmission of a message 3 in a randomaccess procedure.
 9. The base station device according to claim 6,wherein the value of the second parameter is given by the physical layercell identity in a case that the transmission of the physical uplinkshared channel corresponds to the downlink control information to whichthe CRC parity bits scrambled by a temporary C-RNTI are attached and thesequence group hopping is enabled, and the value of the third parameteris given by the physical layer cell identity in a case that thetransmission of the physical uplink shared channel corresponds to thedownlink control information to which the CRC parity bits scrambled bythe temporary C-RNTI are attached and the sequence group hopping isenabled.
 10. The base station device according to claim 9, wherein thetransmission of the physical uplink shared channel that corresponds tothe downlink control information to which the CRC parity bits scrambledby the temporary C-RNTI are attached is used for a retransmission of atransport block in a random access procedure.
 11. A communication methodof a terminal device comprising: receiving a first parameter indicatingthat a sequence group hopping is enabled or disabled; and transmitting ademodulation reference signal associated with transmission of a physicaluplink shared channel, a demodulation reference signal sequence of thedemodulation reference signal being given by a sequence group number anda value related to a cyclic shift, the sequence group number being givenby a second parameter, the value related to the cyclic shift being givenby a third parameter, wherein a value of the second parameter is givenby a value of first information configured by a higher layer in a casethat the value of the first information is configured by the higherlayer, the transmission of the physical uplink shared channelcorresponds to downlink control information to which Cyclic RedundancyCheck (CRC) parity bits scrambled by a Cell-Radio Network TemporaryIdentifier (C-RNTI) are attached, and the sequence group hopping isenabled, the value of the second parameter is given by a physical layercell identity in a case that no value of the first information isconfigured by the higher layer and the sequence group hoping is enabled,the value of the second parameter is given by the physical layer cellidentity in a case that the transmission of the physical uplink sharedchannel corresponds to a random access response grant and the sequencegroup hopping is enabled, a value of the third parameter is given by avalue of second information configured by the higher layer in a casethat the value of the second information is configured by the higherlayer, the transmission of the physical uplink shared channelcorresponds to the downlink control information to which the CRC paritybits scrambled by the C-RNTI are attached, the value of the thirdparameter is given by the physical layer cell identity in a case that novalue of the second information is configured by the higher layer, andthe value of the third parameter is given by the physical layer cellidentity in a case that the transmission of the physical uplink sharedchannel corresponds to the random access response grant.
 12. Thecommunication method according to claim 11, wherein the value of thesecond parameter is zero in a case that the sequence group hopping isdisabled.
 13. The communication method according to claim 11, whereinthe value of the second parameter is given by the physical layer cellidentity in a case that the transmission of the physical uplink sharedchannel corresponds to the downlink control information to which the CRCparity bits scrambled by a temporary C-RNTI are attached and thesequence group hopping is enabled, and the value of the third parameteris given by the physical layer cell identity in a case that thetransmission of the physical uplink shared channel corresponds to thedownlink control information to which the CRC parity bits scrambled bythe temporary C-RNTI are attached and the sequence group hopping isenabled.
 14. A communication method of a base station device comprising:transmitting a first parameter indicating that a sequence group hoppingis enabled or disabled; and receiving a demodulation reference signalassociated with transmission of a physical uplink shared channel, ademodulation reference signal sequence of the demodulation referencesignal being given by a sequence group number and a value related to acyclic shift, the sequence group number being given by a secondparameter, the value related to the cyclic shift being given by a thirdparameter, wherein a value of the second parameter is given by a valueof first information configured by a higher layer in a case that thevalue of the first information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds todownlink control information to which Cyclic Redundancy Check (CRC)parity bits scrambled by a Cell-Radio Network Temporary Identifier(C-RNTI) are attached, and the sequence group hopping is enabled, thevalue of the second parameter is given by a physical layer cell identityin a case that no value of the first information is configured by thehigher layer and the sequence group hoping is enabled, the value of thesecond parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto a random access response grant and the sequence group hopping isenabled, a value of the third parameter is given by a value of secondinformation configured by the higher layer in a case that the value ofthe second information is configured by the higher layer, thetransmission of the physical uplink shared channel corresponds to thedownlink control information to which the CRC parity bits scrambled bythe C-RNTI are attached, the value of the third parameter is given bythe physical layer cell identity in a case that no value of the secondinformation is configured by the higher layer, and the value of thethird parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto the random access response grant.
 15. The communication methodaccording to claim 14, wherein the value of the second parameter is zeroin a case that the sequence group hopping is disabled.
 16. Thecommunication method according to claim 14, wherein the value of thesecond parameter is given by the physical layer cell identity in a casethat the transmission of the physical uplink shared channel correspondsto the downlink control information to which the CRC parity bitsscrambled by a temporary C-RNTI are attached and the sequence grouphopping is enabled, and the value of the third parameter is given by thephysical layer cell identity in a case that the transmission of thephysical uplink shared channel corresponds to the downlink controlinformation to which the CRC parity bits scrambled by the temporaryC-RNTI are attached and the sequence group hopping is enabled.